How many primary key fields allowed for one table?

hi,
when i creating a table , how many primary key fields are allowed for one table.
please any one give ans
thanks

Just checked it, Its 255, not 155. You can have as many key fields as you want, but you can not go over the 255 byte length for the total of all key fields. You will get a warning for over 120, as it says that there is limited functionality with a key over 120 in length.
Again, this is a total length of all key fields.
Regards,
Rich Heilman

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Please help me. Maximum How many primary keys use with in one table
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Hi,
For my knowledge, It depends on the Database & version u r working.. Right..
This is a sample description what I seen for a Database...
Technical Specification of SAP DB Version 7.4
Description                            Maximum Value
Database size                    32 TB (with 8 KB page size)
Number of files/volumes per database64...4096, specified by a configuration parameter
File/volume size (data)      518 ...8 GB (dependent on operating system limitations)
File/volume size (log)1      6 TB (dependent on operating system limitations)
SQL statement length>= 16 KB (Default value 64 KB, specified by a system variable)
SQL character string lengthSpecified by a system variable
Identifier length                32 characters
Numeric precision              38 places
Number of tables unlimited
Number of columns per table (with KEY) 1024
Number of columns per table (without KEY) 1023
Number of primary key columns per table 512
Number of columns in an index 16
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How many SECONDARY INDEXES are created for CLUSTER TABLES?

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I have to add two new fields as primary key fields in a Z TABLE, which is existing in Quality and Production Systems with Data.
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10020      10                            abcxyz      1
10020      10            1234        abcxyz     1
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Default Primary Key Field of any database table

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Please suggest solutions. I am not sure, but i think i read somewhere that every table created has a default primary associated whose value is always incresing with a new addtion of recored and its value never decreases. But i am unable to recollect the field name...i think it is some thing like[b] OID .... But i checked there is no such field name by OID. So please help me with some alternative solution...or by telling the default primary key field name.
Thanx

All the databases I know (namely Informix, PostgreSQL, SQL Server, even Access) have a row id column generated automatically.
PostgreSQL example
There is a way to read the value of this column; for example with PostgreSQL let�s say you have the following:
CREATE TABLE no_id_column (
column_one varchar(80),
column_two varchar(80)
INSERT INTO no_id_column(column_one, column_two) VALUES (�red�, �pink�);
INSERT INTO no_id_column(column_one, column_two) VALUES (�yellow�, �orange�);Certainly, if we executed:
SELECT * FROM no_id_column;Would obtain:
column_one          column_two
red               pink
yellow               orangeBut if we modify the query
SELECT oid, * FROM no_id_column;We magically obtain a row identificator
oid          column_one          column_two
21569          red               pink
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Hi,
I have a dynamic internal table created.
In the dynamic internal table,
How to concatenate all the primary keys of that row concatenated into a string and non primary keys into a different string.
Can some one help me on this.
E.g:
Itab1 has 3 Primary fields and 3 Non primary key fields and it has 2 records.
Table     col1     col2     col3     col4     col5     col6
Row1     AA     AB     AC     1     2     3
Row2     ZA     ZB     ZC     1     2     3
The following is needed.
Itab2 will have the concatenate strings
                   Key                               Nkey
Row1        AAABAC                      010203
Row2        ZAZBZC                       010203
Thanks,
Chaithanya

C,
Try something like this - Use an ASSIGN in a LOOP:
data: lv_PK type string.
data: lv_non_PK type string.
field-symbols: lv_str type string.
assign local copy of initial line of gt_table to <ls_table>.
loop at gt_table. " this is your table.
    do n times. " n = 6 in your case
      if n < 4.
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         concatenate <lv_str> to lv_PK.
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         concatenate <lv_str> to lv_Non_PK.
     endif.
    enddo.
    append <ls_table> to <gt_table>.
endloop.

Assigning primary key and index for a table

I have a database consisting of only one table with 10 million rows which mostly looks like this:
RECORDDATE                     ID     CLASS     VALUE
24-JAN-12 10.52.47.000000 AM     96     3     0
24-JAN-12 10.52.48.000000 AM     96     10     156
24-JAN-12 10.52.48.000000 AM     96     3     0
24-JAN-12 10.52.48.000000 AM     96     3     0
24-JAN-12 10.52.48.000000 AM     96     3     0
24-JAN-12 10.52.48.000000 AM     96     3     0
24-JAN-12 10.52.48.000000 AM     96     10     156
24-JAN-12 10.52.48.000000 AM     96     3     0
24-JAN-12 10.52.48.000000 AM     96     3     0
24-JAN-12 10.52.48.000000 AM     96     6     38
24-JAN-12 10.53.05.000000 AM     253     16     197
24-JAN-12 10.53.06.000000 AM     98     10     150
24-JAN-12 10.53.06.000000 AM     98     0     0
24-JAN-12 10.53.06.000000 AM     98     4     0
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select distinct      ID
from      scdatabase4
where ID < 253
order by 1Since database is not my primary job and have no background of it, I'm really confused about what to do to fix my issues. Could someone please help me in assigning primary key and index if you agree that this is the problem?!

Execute the query below to help decide what column to index:
SELECT COLUMN_NAME, NUM_DISTINCT, NUM_NULLS, NUM_BUCKETS, DENSITY
FROM DBA_TAB_COL_STATISTICS
WHERE TABLE_NAME = 'your_table_name'
ORDER BY COLUMN_NAME;
The important columns are:
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2) NUM_NULL: Indicates the number of null values for each column. A column with few null values is a good candidate for a index
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How add primary key constraint to already existing table with data

I want apply primary key constraint to already existing table with data
is there any command or way to do

Alternatively, assuming you want to ensure uniqueness in your primary key column you can do this:
alter table <table name> add constraint <cons name> primary key (col1,col2) exceptions into <exception_table>
If the altter table statement fails this will populate the EXCEPTIONS table with the rows that contain duplicate values for (col1,col2).
You will need to run (or get a DBA to run) a script called UTLEXCPT.SQL (which will be in the $ORACLE_HOME/rdbms/admin directory) if you don't already have an EXCEPTIONS table.
Cheers, APC

How many primary keys for one table?can we add more primary keys

In general Table have one primary key.is it possible to more than one primary key in a table?(ie is it possible to add more than one pirmary key in a table). Help me out.

pls do check this link
[http://help.sap.com/saphelp_nw04/helpdata/en/cf/21ea0b446011d189700000e8322d00/frameset.htm|http://help.sap.com/saphelp_nw04/helpdata/en/cf/21ea0b446011d189700000e8322d00/frameset.htm]
All the key fields of a table must be stored together at the beginning of the table. A non-key field may not occur between two key fields.
A maximum of 16 key fields per table is permitted. The maximum length of the table key is 255.
If the key length is greater than 120, there are restrictions when transporting table entries. The key can only be specified up to a maximum of 120 places in a transport. If the key is larger than 120, table entries must be transported generically.

How to get the primary key names right for child tables?

I have a logical model with a parent table and two child tables. The engineering strategy is "table per child". The parent has an primary key attribute. This is a screen shot:
https://lh5.googleusercontent.com/-iKMtA3Say5c/UIkG1iktgEI/AAAAAAAAAtc/mrwFeHm4gi4/s800/child_pk_log.png
When I engineer the model I get two primary keys with the same name name, which is the name of the parent:
https://lh3.googleusercontent.com/-N88a9VwoPKw/UIkG1spbXpI/AAAAAAAAAtY/eonf8WdUZ6I/s800/child_pk_rel.png
The correct names would be CHILD1_PK and CHILD2_PK. I can change the relational model by applying the naming rules but the next engineering will trash the names again.
How can I fix this?

Hi,
the problem with PK name is fixed in Data Modeler 3.2.
You can change PK name in relational model it won't be changed on next engineering
Philip

How many Sequence-Tags are allowed in one BPEL-File?

Hello!
I have read that only one Sequenze-Tag per BPEL-File is allowed. If I need more acticvities I should use scopes inside the Sequenze-Tag. Is this true? Actually I am working on a BPEL-File which contains two more Sequenze-Tags inside the all-embracing Sequenze-Tag. Is this legal?

if you look into the bpel schema, which can be found here
http://schemas.xmlsoap.org/ws/2003/03/business-process/
and look at this here
- <complexType name="tProcess">
- <complexContent>
- <extension base="bpws:tExtensibleElements">
- <sequence>
<element name="partnerLinks" type="bpws:tPartnerLinks" minOccurs="0" />
<element name="partners" type="bpws:tPartners" minOccurs="0" />
<element name="variables" type="bpws:tVariables" minOccurs="0" />
<element name="correlationSets" type="bpws:tCorrelationSets" minOccurs="0" />
<element name="faultHandlers" type="bpws:tFaultHandlers" minOccurs="0" />
<element name="compensationHandler" type="bpws:tCompensationHandler" minOccurs="0" />
<element name="eventHandlers" type="bpws:tEventHandlers" minOccurs="0" />
<group ref="bpws:activity" />
</sequence>
it means max one activity .. and in a scope as shown here
- <complexType name="tScope">
- <complexContent>
- <extension base="bpws:tActivity">
- <sequence>
<element name="variables" type="bpws:tVariables" minOccurs="0" /> <element name="correlationSets" type="bpws:tCorrelationSets" minOccurs="0" />
<element name="faultHandlers" type="bpws:tFaultHandlers" minOccurs="0" />
<element name="compensationHandler" type="bpws:tCompensationHandler" minOccurs="0" />
<element name="eventHandlers" type="bpws:tEventHandlers" minOccurs="0" />
<group ref="bpws:activity" />
</sequence>
<attribute name="variableAccessSerializable" type="bpws:tBoolean" default="no" />
</extension>
</complexContent>
</complexType>
the same .. in a sequence shown below
- <complexType name="tSequence">
- <complexContent>
- <extension base="bpws:tActivity">
- <sequence>
<group ref="bpws:activity" maxOccurs="unbounded" />
</sequence>
</extension>
</complexContent>
</complexType>
0 -> many
Bottom line, one activity within a process, one activity per scope. n activities within a sequence
htc clemens

How many primary key fields allowed for one table?

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