How many iPad charging cables are there?

How many iPad charging cables are there? Anyone know 'officially'?

I suggest you ask the question you are really trying to discover the answer to; for example:
"I need a new charging cable for my iPad 2. I see there are three different charging cables at the Apple Store. One has a lightning connector. One has a 30 pin connector. The third has an L-shaped connector. Which one (or ones) of these would work for my iPad 2?"

Similar Messages

How many types of ports are there which we use for data transfe in ale/idoc

friends let me know how many types of ports are there which we use for transfering
data in ale/idocs?

Hello,
you can use file port,trnasactional RFC port.FI you are using IDOC-XML conversion combination,then you can XML port also.
Thanks

How many types of rfcs are there

Hello,
Can any body explain about how many type of rfcs are there. give the difference also.
Thanks.

Hi,
Check this info.
These are the types of RFC
Asynchronous RFC (aRFC)
Synchronous RFC (sRFC)
Transactional RFC (tRFC)
Queued RFC (qRFC)
Parallel RFC (pRFC)
Asynchronous RFC :
This is used when you need to increase the performance of ABAP program by having system call more than one function module in parallel than forcing the program to wait for results .
Transactional RFC
This let you group one or more function module call together o tRFC LUW and ensure that fucnction module within LUW is called once . In contrast to aRFC and sRFC the tRFC belonging to tRFC LUW are executed in order .
tRFC is always used if a function is executed as a Logical Unit of Work (LUW). Within a LUW, all calls are
1.Executed in the order in which they are called
2.Executed in the same program context in the target system
3.Run as a single transaction: they are either committed or rolled back as a unit.
Implementation of tRFC is recommended if you want to guarantee that the transactional order of the calls is preserved
Asynchronous remote function calls (aRFCs) are similar to transactional RFCs, in that the user does not have to wait for their completion before continuing the calling dialog. There are three characteristics, however, that distinguish asynchronous RFCs from transactional RFCs:
When the caller starts an asynchronous RFC, the called server must be available to accept the request.
The parameters of asynchronous RFCs are not logged to the database, but sent directly to the server.
Asynchronous RFCs allow the user to carry on an interactive dialog with the remote system.
The calling program can receive results from the asynchronous RFC.
You can use asynchronous remote function calls whenever you need to establish communication with a remote system, but do not want to wait for the functions result before continuing processing. Asynchronous RFCs can also be sent to the same system. In this case, the system opens a new session (or window). You can then switch back and for between the calling dialog and the called session
RECEIVE RESULTS FROM FUNCTION Remotefunction is used within a FORM routine to receive the results of an asynchronous remote function call. The following receiving parameters are available:
IMPORTING
TABLES
EXCEPTIONS
The addition KEEPING TASK prevents an asynchronous connection from being closed after receiving the results of the processing. The relevant remote context (roll area) is kept for re-use until the caller terminates the connection.
Transactional RFC (tRFC) and Queued RFC (qRFC).
tRFC is used mainly to transfer ALE Intermediate Documents (IDocs).
Transactional RFC:
If an error occurs during a synchronous remote function call, the system cannot tell at what point the error occurred (most crucially, whether the function module was actually processed in R/3 before the operation failed). Restarting a failed call is therefore a dangerous thing to do, since you risk duplicating a completed function call.
To alleviate this problem, you can use transactional RFC, which guarantees that each function call you issue will only be executed once, even if you submit it repeatedly to the R/3 System. The system implements this safeguard by assigning a unique transaction ID (TID) to each transaction that you submit. When you attempt to process the transaction, the system checks whether that TID has already been processed. If it has, the transaction is ignored.
Disadvantages of tRFC
- tRFC processes all LUWs independent of one another. Due to the amount of activated tRFC processes, this procedure can reduce performance significantly in both the send and the target systems.
- In addition, the sequence of LUWs defined in the application cannot be kept. Therefore, there is no guarantee that the transactions are executed in the sequence dictated by the application. The only guarantee is that all LUWs are transferred sooner or later.
Queued RFC:
When you use transactional RFC, you cannot guarantee the order in which the function calls will be processed in the system (it is quite possible that one call might overtake another). For cases where you need to specify a particular processing order, you can use queued RFC, which is an extension of transactional RFC. In qRFC, you place each function call in a logical queue. A function call cannot be executed until all of its predecessors in the queue have been processed. Queued RFC calls are processed asynchronously
Therefore, Queued RFC is better than Transactional RFC.
Remote Function Call:
RFC is an SAP interface protocol. Based on CPI-C, it considerably simplifies the programming of communication processes between systems.
RFCs enable you to call and execute predefined functions in a remote system - or even in the same system.
RFCs manage the communication process, parameter transfer and error handling.
http://help.sap.com/saphelp_47x200/helpdata/en/22/042860488911d189490000e829fbbd/frameset.htm.
Remote Function Call (RFC) is the standard SAP interface for communication between SAP systems. The RFC calls a function to be executed in a remote system.
Synchronous RFC:
The first version of RFC is synchronous RFC (sRFC). This type of RFC executes the function call based on synchronous communication, which means that the systems involved must both be available at the time the call is made.
Transactional RFC (tRFC) and Queued RFC (qRFC). tRFC is used mainly to transfer ALE Intermediate Documents (IDocs).
Transactional RFC:
If an error occurs during a synchronous remote function call, the system cannot tell at what point the error occurred (most crucially, whether the function module was actually processed in R/3 before the operation failed). Restarting a failed call is therefore a dangerous thing to do, since you risk duplicating a completed function call.
To alleviate this problem, you can use transactional RFC, which guarantees that each function call you issue will only be executed once, even if you submit it repeatedly to the R/3 System. The system implements this safeguard by assigning a unique transaction ID (TID) to each transaction that you submit. When you attempt to process the transaction, the system checks whether that TID has already been processed. If it has, the transaction is ignored.
Queued RFC:
When you use transactional RFC, you cannot guarantee the order in which the function calls will be processed in the system (it is quite possible that one call might overtake another). For cases where you need to specify a particular processing order, you can use queued RFC, which is an extension of transactional RFC. In qRFC, you place each function call in a logical queue. A function call cannot be executed until all of its predecessors in the queue have been processed. Queued RFC calls are processed asynchronously
For more information on RFC, please go through the link.
http://help.sap.com/saphelp_nw04/helpdata/en/6f/1bd5b6a85b11d6b28500508b5d5211/content.htm
Have a look at this link.
http://help.sap.com/printdocu/core/Print46c/en/data/pdf/BCFESDE2/BCFESDE2.pdf
http://help.sap.com/saphelp_47x200/helpdata/en/22/042860488911d189490000e829fbbd/frameset.htm.
Rewords some points.
Rgds,
P.Nag

How many types of messages are there

Hi,
After using CALL TRANSACTION tcode USING gi_bdcdata
                 MODE   gv_ctumode
                 UPDATE gv_cupdate
                 MESSAGES INTO gi_messtab.
I am looping gi_messtab for extracting messages.
I know msgtyp = 'E'    -
> means error message.
I want to how many types of messages are there, tell me with the full forms.
s -
> means?
LOOP AT gi_messtab.
IF gi_messtab-msgtyp = 'E'.
endif.
endloop.

HI Mohan
A --> Termination Message
The message appears in a dialog box, and the program terminates. When the user has confirmed the message, control returns to the next-highest area menu.
E --> Error Message
Depending on the program context, an error dialog appears or the program terminates.
I --> Information
The message appears in a dialog box. Once the user has confirmed the message, the program continues immediately after the MESSAGE statement.
S --> Status Message and Sucess message
The program continues normally after the MESSAGE statement, and the message is displayed in the status bar of the next screen.
W --> Warning
Depending on the program context, an error dialog appears or the program terminates.
X --> Exit
No message is displayed, and the program terminates with a short dump. Program terminations with a short dump normally only occur when a runtime error occurs. Message type X allows you to force a program termination. The short dump contains the message ID.
Regards
Sudheer

How many types of requests are there

hai,
how many types of requests are there plz explain it plzzzzzzzzzzz
thanks and regards,
pg babu

Hi ,
We are not at all clear about your query here. Please let us know what kind of requests you are telling about. Is it regarding data base requests?
Regards,
Abhisek

How many types of joins are there?

how many types of joins are there?
Edited by: Alvaro Tejada Galindo on Feb 21, 2008 4:58 PM

Hi,
Joins are used to fetch data fast from Database tables:
Tables are joined with the proper key fields to fetch the data properly.
If there are no proper key fields between tables don't use Joins;
Important thing is that don't USE JOINS FOR CLUSTER tableslike BSEG and KONV.
Only use for Transparenmt tables.
You can also use joins for the database VIews to fetch the data.
JOINS
... FROM tabref1 INNER JOIN tabref2 ON cond
The data is to be selected from transparent database tables and/or views determined by tabref1 and tabref2. tabref1 and tabref2 each have the same form as in variant 1 or are themselves Join expressions. The keyword INNER does not have to be specified. The database tables or views determined by tabref1 and tabref2 must be recognized by the ABAP Dictionary.
In a relational data structure, it is quite normal for data that belongs together to be split up across several tables to help the process of standardization (see relational databases). To regroup this information into a database query, you can link tables using the join command. This formulates conditions for the columns in the tables involved. The inner join contains all combinations of lines from the database table determined by tabref1 with lines from the table determined by tabref2, whose values together meet the logical condition (join condition) specified using ON>cond.
Inner join between table 1 and table 2, where column D in both tables in the join condition is set the same:
Table 1 Table 2
A B C D    D E F G H
a1 b1 c1 1    1 e1 f1 g1 h1
a2 b2 c2 1    3 e2 f2 g2 h2
a3 b3 c3 2    4 e3 f3 g3 h3
a4 b4 c4 3    -
Inner Join
A B C D D E F G H
a1 b1 c1 1 1 e1 f1 g1 h1
a2 b2 c2 1 1 e1 f1 g1 h1
a4 b4 c4 3 3 e2 f2 g2 h2
Example
Output a list of all flights from Frankfurt to New York between September 10th and 20th, 2001 that are not sold out:
DATA: DATE LIKE SFLIGHT-FLDATE,
CARRID LIKE SFLIGHT-CARRID,
CONNID LIKE SFLIGHT-CONNID.
SELECT FCARRID FCONNID F~FLDATE
INTO (CARRID, CONNID, DATE)
FROM SFLIGHT AS F INNER JOIN SPFLI AS P
ON FCARRID = PCARRID AND
FCONNID = PCONNID
WHERE P~CITYFROM = 'FRANKFURT'
AND P~CITYTO = 'NEW YORK'
AND F~FLDATE BETWEEN '20010910' AND '20010920'
AND FSEATSOCC < FSEATSMAX.
WRITE: / DATE, CARRID, CONNID.
ENDSELECT.
If there are columns with the same name in both tables, you must distinguish between them by prefixing the field descriptor with the table name or a table alias.
In order to determine the result of a SELECT command where the FROM clause contains a join, the database system first creates a temporary table containing the lines that meet the ON condition. The WHERE condition is then applied to the temporary table. It does not matter in an inner join whether the condition is in the ON or WHEREclause. The following example returns the same solution as the previous one.
Example
Output of a list of all flights from Frankfurt to New York between September 10th and 20th, 2001 that are not sold out:
DATA: DATE LIKE SFLIGHT-FLDATE,
CARRID LIKE SFLIGHT-CARRID,
CONNID LIKE SFLIGHT-CONNID.
SELECT FCARRID FCONNID F~FLDATE
INTO (CARRID, CONNID, DATE)
FROM SFLIGHT AS F INNER JOIN SPFLI AS P
ON FCARRID = PCARRID
WHERE FCONNID = PCONNID
AND P~CITYFROM = 'FRANKFURT'
AND P~CITYTO = 'NEW YORK'
AND F~FLDATE BETWEEN '20010910' AND '20010920'
AND FSEATSOCC < FSEATSMAX.
WRITE: / DATE, CARRID, CONNID.
ENDSELECT.
Since not all of the database systems supported by SAP use the standard syntax for ON conditions, the syntax has been restricted. It only allows those joins that produce the same results on all of the supported database systems:
Only a table or view may appear to the right of the JOIN operator, not another join expression.
Only AND is possible in the ON condition as a logical operator.
Each comparison in the ON condition must contain a field from the right-hand table.
If an outer join occurs in the FROM clause, all the ON conditions must contain at least one "real" JOIN condition (a condition that contains a field from tabref1 amd a field from tabref2.
In some cases, '*' may be specified in the SELECT clause, and an internal table or work area is entered into the INTO clause (instead of a list of fields). If so, the fields are written to the target area from left to right in the order in which the tables appear in the FROM clause, according to the structure of each table work area. There can then be gaps between table work areas if you use an Alignment Request. For this reason, you should define the target work area with reference to the types of the database tables, not simply by counting the total number of fields. For an example, see below:
Variant 3
... FROM tabref1 LEFT OUTER JOIN tabref2 ON cond
Effect
Selects the data from the transparent database tables and/or views specified in tabref1 and tabref2. tabref1 und tabref2 both have either the same form as in variant 1 or are themselves join expressions. The keyword OUTER can be omitted. The database tables or views specified in tabref1 and tabref2 must be recognized by the ABAP-Dictionary.
In order to determine the result of a SELECT command where the FROM clause contains a left outer join, the database system creates a temporary table containing the lines that meet the ON condition. The remaining fields from the left-hand table (tabref1) are then added to this table, and their corresponding fields from the right-hand table are filled with ZERO values. The system then applies the WHERE condition to the table.
Left outer join between table 1 and table 2 where column D in both tables set the join condition:
Table 1 Table 2
A B C D    D E F G H
a1 b1 c1 1    1 e1 f1 g1 h1
a2 b2 c2 1    3 e2 f2 g2 h2
a3 b3 c3 2    4 e3 f3 g3 h3
a4 b4 c4 3    -
Left Outer Join
A B C D D E F G H
a1 b1 c1 1 1 e1 f1 g1 h1
a2 b2 c2 1 1 e1 f1 g1 h1
a3 b3 c3 2 NULL NULL NULL NULL NULL
a4 b4 c4 3 3 e2 f2 g2 h2
Example
Output a list of all custimers with their bookings for October 15th, 2001:
DATA: CUSTOMER TYPE SCUSTOM,
BOOKING TYPE SBOOK.
SELECT SCUSTOMNAME SCUSTOMPOSTCODE SCUSTOM~CITY
SBOOKFLDATE SBOOKCARRID SBOOKCONNID SBOOKBOOKID
INTO (CUSTOMER-NAME, CUSTOMER-POSTCODE, CUSTOMER-CITY,
BOOKING-FLDATE, BOOKING-CARRID, BOOKING-CONNID,
BOOKING-BOOKID)
FROM SCUSTOM LEFT OUTER JOIN SBOOK
ON SCUSTOMID = SBOOKCUSTOMID AND
SBOOK~FLDATE = '20011015'
ORDER BY SCUSTOMNAME SBOOKFLDATE.
WRITE: / CUSTOMER-NAME, CUSTOMER-POSTCODE, CUSTOMER-CITY,
BOOKING-FLDATE, BOOKING-CARRID, BOOKING-CONNID,
BOOKING-BOOKID.
ENDSELECT.
If there are columns with the same name in both tables, you must distinguish between them by prefixing the field descriptor with the table name or using an alias.
Note
For the resulting set of a SELECT command with a left outer join in the FROM clause, it is generally of crucial importance whether a logical condition is in the ON or WHERE condition. Since not all of the database systems supported by SAP themselves support the standard syntax and semantics of the left outer join, the syntax has been restricted to those cases that return the same solution in all database systems:
Only a table or view may come after the JOIN operator, not another join statement.
The only logical operator allowed in the ON condition is AND.
Each comparison in the ON condition must contain a field from the right-hand table.
Comparisons in the WHERE condition must not contain a field from the right-hand table.
The ON condition must contain at least one "real" JOIN condition (a condition in which a field from tabref1 as well as from tabref2 occurs).
Note
In some cases, '*' may be specivied as the field list in the SELECT clause, and an internal table or work area is entered in the INTO clause (instead of a list of fields). If so, the fields are written to the target area from left to right in the order in which the tables appear in the llen in der FROM clause, according to the structure of each table work area. There can be gaps between the table work areas if you use an Alignment Request. For this reason, you should define the target work area with reference to the types of the database tables, as in the following example (not simply by counting the total number of fields).
Example
Example of a JOIN with more than two tables: Select all flights from Frankfurt to New York between September 10th and 20th, 2001 where there are available places, and display the name of the airline.
DATA: BEGIN OF WA,
FLIGHT TYPE SFLIGHT,
PFLI TYPE SPFLI,
CARR TYPE SCARR,
END OF WA.
SELECT * INTO WA
FROM ( SFLIGHT AS F INNER JOIN SPFLI AS P
ON FCARRID = PCARRID AND
FCONNID = PCONNID )
INNER JOIN SCARR AS C
ON FCARRID = CCARRID
WHERE P~CITYFROM = 'FRANKFURT'
AND P~CITYTO = 'NEW YORK'
AND F~FLDATE BETWEEN '20010910' AND '20010920'
AND FSEATSOCC < FSEATSMAX.
WRITE: / WA-CARR-CARRNAME, WA-FLIGHT-FLDATE, WA-FLIGHT-CARRID,
WA-FLIGHT-CONNID.
ENDSELECT.

How many types of messages are there what are they?

How many types of messages are there? what are they?

Hi,
Refer the Demo program this iwll help
<b>DEMO_MESSAGES</b>
1. MESSAGE xnnn.
2. MESSAGE ID id TYPE mtype NUMBER n.
3. MESSAGE xnnn(mid).
Effect
Sends a message. Messages are stored in table T100, and can be maintained using Transaction SE91. They are fully integrated in the forward navigation of the ABAP Workbench.
The ABAP runtime environment handles messages according to the message type specified in the MESSAGE statement and the context in which the message is sent. There are six kinds of message type:
A (Abend)
Termination
E (Error)
Error
I (Info)
Information
S (Status)
Status message
W (Warning)
Warning
X (Exit)
Termination with short dump
Messages are used primarily to handle user input on screens. The following table shows how each message type behaves in different contexts. The numbers are explained at the end of the table.
A E I S W X
PAI module 1 2 3 4 5 6
PAI module at POH 1 7 3 4 7 6
PAI module at POV 1 7 3 4 7 6
AT SELECTION-SCREEN ... 1 8 3 4 9 6
AT SELECTION-SCREEN at POH 1 7 3 4 7 6
AT SELECTION-SCREEN at POV 1 7 3 4 7 6
AT SELECTION-SCREEN ON EXIT 1 7 3 4 7 6
AT LINE-SELECTION 1 10 3 4 10 6
AT PFn 1 10 3 4 10 6
AT USER-COMMAND 1 10 3 4 10 6
INITIALIZATION 1 11 3 4 11 6
START-OF-SELECTION 1 11 3 4 11 6
GET 1 11 3 4 11 6
END-OF-SELECTION 1 11 3 4 11 6
TOP-OF-PAGE 1 11 3 4 11 6
END-OF-PAGE 1 11 3 4 11 6
TOP-OF-PAGE DURING ... 1 10 3 4 10 6
LOAD-OF-PROGRAM 1 1 4 4 4 6
PBO module 1 1 4 4 4 6
AT SELECTION-SCREEN OUTPUT 1 1 4 4 4 6
reward if this helps.

How many standard business roles are there in CRM

Hi Experts,
I had a question in one of my exam.. please answer it
question:- How many standard business roles are there in CRM?
options were:- 2,3,4,5
I think the options does not have the right answer , upto my knowledge it is more than 5. please help me with the appropriate answer
Thanks
Rahul Mathur

Hi,
There are approximately 40 standard business roles available in the latest version ehp3.
As the version changes the business roles increases. Initially there are only 3 std business roles..
1.sales pro 2. marketing pro 3. service pro and along with IC Agent.
Each BR above is loaded with huge no of transactions even though our aim is to for ex: create sales order...we use sales pro but all the sales related operations(transactions) are being loaded in to the system so along with the version improvements/releases SAP have divided each of these std BR as much as they can and thus the no of operations or transactions per BR is decreasing with each release....
Thanks & Regards,
Malleswar.

How many types of servlets are there

posted June 12, 2006 03:36 AM
HI EveryOne
what are the different types of servlets.
If we want to write our own servlet for particular protocol
what to do ?

I don't think it goes as far as needing to change the server. You just have to do a bunch of subclassing and servlet mapping.
I would start with a subclass of GenericServlet that mimics the functionality of HttpServlet. For example, if I had an FtpServlet it might override the service method to read the FTP request and forward it to a doUser, doPass, doChangeWorkingDirectory, doQuit, doPort, doMode, doRetrieve, doStore, doAppend, etc... methods (there are a lot of commands for FTP.
You would probably want to make FtpServletRequest and FtpServletResponse classes as well. For instance, your FtpServlet would probably make an FtpServletRequest (that would double as the user's FTP session since FTP really is a sequence of requests) that stores all the user's previous commands and their order. It is maintained (probably mapped to the user's IP address) on a per-user basis until they doQuit.
The FtpServletResponse would be a a little more complicated. I would probably design it to do the data transfer part of FTP. It would then be a Thread that managed a URLConnection to the client to get or send data to.
You design your servlets to extend your FtpServlet and override those methods whose default functionality you want to change and maybe design a good wrapping system to make it easy to do the different FtpResponses that would be required.
You configure the server to listen to port 21, and your firewall to allow two way traffic on port 20. You would map all incoming calls to a default FtpServlet whose actual class you define in web.xml.
I think you then have a working FtpServlet without the need to force the web server to recognize that it is doing it.
Come to think of it, you probably wouldn't need a lot of subclassing of the FtpServlet. Probably just one for every site you want to host (would you want to have special cases for specific files?).
I guess the real room for developement would be to get an FTP command that does one of the myriad of FTP actions. As you develope them you could probably use servlet parameters in web.xml to define which class to call for each of the actions...
I digress. What meant to say was that all you have to do is some subclassing and URL mapping. No real change to the server itself.

How many useful random generators are there in Illustrator?

Like, any kind of random generator. Scatter brush is somewhat lacking but looks like only viable one. Transform effect also has random checkbox but I don't really understand what it actually does.
So, other than scatter brush, is there any kind of random generator that I can make use of?

Much can be achieved with the built in features, you can get further results by combining multiple features together also, thus extending the possibilities and outcomes. Be creative and explore. You can also get into scripting your own features by utilizing Illustrators scripting features. You can then leverage a lot of randomness within the confines of whats available via the scripting api. You can learn more and get started here http://www.adobe.com/devnet/illustrator/scripting.html , of course this approach requires a bigger learning curve than the built in features found in Illustrator natively.
Curious, what is it that your hoping to achieve overall, anything specific?

How many types of exits are there...

explain each exit with a simple easy example...
Message was edited by:
balaji velpuri

explain each exit with a simple easy example...
Message was edited by:
balaji velpuri

How many ipads can I charge on 1 20amp circuit?

How many ipads can I charge on 1 20amp circuit?

Bryan,
According to iTunes Store: Associating a device or computer to your Apple ID:
"Your Apple ID can have up to 10 devices and computers (combined) associated with it. Each computer must also be authorized using the same Apple ID. Once a device or computer is associated with your Apple ID, you cannot associate that device or computer with another Apple ID for 90 days."

How many screen-on time are you getting while playing?

How many screen-on time are you getting while playing games on the iPad Mini Retina? I'm planning to buy one and use it mainly for games. I currently own a Samsung Tab S 8.4 which can only last 4 hours screen-on time while playing Clash of Clans.

Unfortunately no one can give you an exact length of time. The stated battery life on an iPad is in the 10 hour area. But there are so many variables that it's impossible to give you any sort of exact length.
I would GUESS, if you spent the whole day gaming on a fresh charge, you may get 5-6 hours but that is a total blind guess. some games demand more power than others so there is no set way to know.

How many iPads can use one content viewer login?

Hi all,
We have a client who is wanting an app built in the next few months but needs a smaller version up and running in the next few weeks to get them out of a tight spot.
I've suggested that we give them an Adobe ID seperate to ours and load the interim app up there for reps use while we keep building the final one seperately.
My question is, how many iPad's can use that login and download the app to the content viewer and use it like that. They will need to use it on about 40 iPads...
(I hope my question makes sense)
Cheers
G.

Unfortunately the only time an Adobe ID belongs to the company instead of the individual is when the company signs on as a DPS customer and creates the ID under their master admin account in the DPS admin portal. All other uses of Adobe ID belong to an individual and not a company. In short, Adobe tech support isn't going to be able to help a company "reclaim" an Adobe ID if it is used this way.
Just fair warning for those that are sharing Adobe ID credentials and using this method to share content.

How far will the extreme reach and how many users can be on there at the same time?

How far will the airport extreme reach and how many users can be on there at the same time?

Last question first, since that is the easy one......approximately 50 (fifty) users for wireless depending on how active each user might be.
The first question is much more difficult, as distance is not really the issue with wireless.....obstructions are the issue.
A wireless signal can easily travel 300 feet or more with no obstructions in the signal path.
But, a typical wall of sheetrock or wallboard in a home will absorb....on average....15-20% of the wireless signal. Brick or adobe will obviously absorb much more. A ceiling....because it is thicker....will absorb about 25-35% of the signal.
So, if the wireless signal must pass through several walls and a ceiling, there won't be much, if any, of the signal left....even though the distance that the signal travels is not great...for example, 20-25 feet.
Other wireless networks around you at the neighbors can also affect the relative strength of the wireless signal.
The bottom line....locate the AirPort Extreme where wireless devices will receive a signal with the least amount of obstructions in the signal path. Your actual performance cannot be predicted in advance. You will not know how well the AirPort Extreme works for you until you try it out in your home.
If you find that the signal does not reach as far as needed, you will need to add additional "extenders", like an AirPort Express to provide more signal coverage.

How many iPad charging cables are there?

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