Sql query across multiple tables ina database

I have 3 MS Access tables in database that are linked by keyed fields in the table. Is there a way to fetch only certain records that match a criteria across all three of these tables using the database connectivity toolset VIs?

Thanks. I am trying to mechanize/run an SQL query like this
SELECT Code_Type.Code_NUM, Code_Type.Code_Word, Word_Type.Parm_Label, Word_Type.Word_Sequence, Word_Type.Num_Words, Parameter_Label.Parm_Label, Parameter_Label.Parm_Name, Parameter_Label.Num_Bits, Parameter_Label.Num_Bits
FROM (Code_Type INNER JOIN Word_Type ON Code_Type.Code_Word = Word_Type.Code_Word) INNER JOIN Parameter_Label ON Word_Type.Parm_Label = Parameter_Label.Parm_Label;
while using the VIs in the database connectivity toolset. How do I code this using these VIs? I dont see an example of a straight SQL string like this being able to be put into the VIs.

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Mysql query (search multiple tables in database)

I have 12 tables in a database - january through to december.
I need to search all 12 tables for 'keyworrd' phrases submitted by the user through a search form.
Must be a more streamlined way of doing it than below using 'UNION'. I have incorporated 2 tables in the below query but I need a more 'condensed' query for all 12 tables?
$sql = ('SELECT * FROM january WHERE tourTitle = "'.$keyword.'" UNION SELECT * FROM february WHERE tourTitle = "'.$keyword.'"');
Cheers
Os

bregent wrote:
>That's what I did last year but thought I'd break it down this year into 12 easier to work with tables.
No, Ben is correct. Using 1 table for each month is absolutely the wrong way. It violates basic rules of normalization and causes all sorts of problems.
>Breaking it down appeals to be more so I can keep all the relevant months
>together instead of potentially becoming scattered throught-out one table.
That's what you use the Order By clause for.
>If by any chance the client says they want to update x, y or z I can go
>straight to the month in question without the necessity to flip through
>dozens of pages in phpMyAdmin as there is no real CMS management in place for this process.
Not sure what you are saying. Performing inserts, updates and queries is much simpler using a single table.
Whenever someone asks for a way to search through multiple tables, it tells me that the data structure is not designed well.
When I did this job last year there was about 60 pages created in phpMyAdmin. The records for January could be anywhere on those 60 pages as I may have to add additional records much later on in the process.
My thinking behind this was to keep all the month entries together so I could view them easily in phpMyAdmin.
Now due to my lack of knowlege about phpMyAdmin it could be possible to create a query to show only the january entries, I suspect it can do this.
I agree it is a lot simpler using 1 table to select and search through BUT I need if the ocassion arises to be able to view all the january or february entries etc one after the other, not 10 on page 2 and 3 on page 7 and 5 more on page 47 of phpMyAdmin.
So i quess what I really need is to write a select query in phpMyAdmin which only shows the selected entries for the month requested. I have not done much investigation into what phpMyAdmin can do........so I suppose I need to.
EDITED:
Arrgh you see IT WAS SO SIMPLE:
SELECT * FROM `tours` WHERE month = "March"
It's because I'm frightened of the bloody thing in case I mess something up!

Running sql query across multiple (remote) databases

I'd like to run a query that pulls information from multiple databases which are not on the same machine. Is this possible using SQL Developer?

If you are still interested, there is a tool that can query multiple databases and save results in a single text file that you can then modify as necessary - see www.bsutils.com/MuSQL.html

SQL query with multiple tables - what is the most efficient way?

Hello I am learning PL/SQL. I have a simple procedure where I need to find number of employees and departments per location as per user input of location_id.
I have 3 Tables:
LOCATIONS
location_id (pk)
location_name
DEPARTMENTS
department_id (pk)
location_id (fk)
department_name
EMPLOYEES
employee_id (pk)
department_id (fk)
employee_name
1 Location can have 0-MANY Departments
1 Employee has 1 Department
Here is the query I came up with for PL/SQL procedure:
/*Ecount, Dcount are NUMBER variables */
SELECT SUM (EmployeeCount), COUNT(DepartmentNumber)
     INTO Ecount, Dcount
     FROM
     (SELECT COUNT(employee_id) EmployeeCount, department_id DepartmentNumber
          FROM employees
          GROUP BY department_id
          HAVING department_id IN
                    (SELECT department_id
                    FROM departments
                    WHERE location_id = userInput));
I do get the correct result, but I am just wondering if my query is on the right track and if there is a more "efficient" way of doing this.
Thanks in advance for helping a newbie out.

Hi,
Welcome to the forum!
Something like this will be more efficient:
SELECT    COUNT (employee_id)               AS ECount
,       COUNT (DISTINCT department_id)     AS DCount
FROM       employees
WHERE       department_id IN (     SELECT     department_id
                    FROM      departments
                    WHERE      location_id = :userInput
;You should also try a join instead of the IN subquery.
For efficiency, do only the things you need to do.
For example, you don't need a count of employees in each department, so don't compute one. That means you won't need the in-line view, so don't have one.
You don't need PL/SQL for this job, so don't use PL/SQL if you don't have to. (I realize this question was out of context, so you may have good reasons for doing this in PL/SQL.)
Do all filtering as early as possible. Don't waste effort computing things that won't be used .
A particular example of this is: Never use a HAVING clause when you can use a WHERE clause. What's the difference between a WHERE clause and a HAVING clause? The WHERE clause is applied before aggregate functions are computed, and the HAVING clause is applied after; there's no other difference. Therefore, if the HAVING clause isn't referencing an aggregate function, it could be done in a WHERE clause instead.

SQL query involving multiple tables

I have a scenario in SQL where For each post there are associated tags. A user is one who makes post and he belongs to a particular location. The location corresponds to a particular country.
I create tables as
CREATE TABLE post_table
post_id VARCHAR(20),
user_id VARCHAR(20),
PRIMARY KEY(post_id)
CREATE TABLE tags_table
   post_id VARCHAR(20),
   tags VARCHAR(20),
   PRIMARY KEY(tags, post_id),
   FOREIGN KEY(post_id) REFERENCES post_table(post_id) ON DELETE CASCADE
CREATE TABLE location
location_id VARCHAR(20),
country VARCHAR(20),
PRIMARY KEY (location_id)
CREATE TABLE user_info
user_id VARCHAR(20),
location_id VARCHAR(30),
PRIMARY KEY (user_id),
FOREIGN KEY(location_id) REFERENCES location(location_id) ON DELETE CASCADE
);Now, I insert values in these tables as
INSERT INTO post_table VALUES( 'p1', 'u1' );
INSERT INTO post_table VALUES( 'p2', 'u1' );
INSERT INTO post_table VALUES( 'p3', 'u2' );
INSERT INTO post_table VALUES( 'p4', 'u3' );
INSERT INTO post_table VALUES( 'p5', 'u2' );
INSERT INTO tags_table VALUES( 'p1', 'US Open' );
INSERT INTO tags_table VALUES( 'p1', 'Real good' );
INSERT INTO tags_table VALUES( 'p1', 'Madrid' );
INSERT INTO tags_table VALUES( 'p2', 'Madrid' );
INSERT INTO tags_table VALUES( 'p3', 'Rossoneri' );
INSERT INTO tags_table VALUES( 'p4', 'Milan' );
INSERT INTO tags_table VALUES( 'p4', 'Los Angeles' );
INSERT INTO tags_table VALUES( 'p5', 'Rossoneri' );
INSERT INTO location VALUES( 'loc1', 'Spain');
INSERT INTO location VALUES( 'loc2', 'England');
INSERT INTO user_info VALUES( 'u1', 'loc1' );
INSERT INTO user_info VALUES( 'u2', 'loc2' );
INSERT INTO user_info VALUES( 'u3', 'loc1' );Now I have to fire a query For each country, display the most seen tag(s)
So for this data the result should be like
Country              MostTags
Spain                Madrid
England              RossoneriPlease help me write this query guys.

Hi,
Something like this
select      country
     , tags from
             select      l.country
               , t.tags
               , dense_rank() over (     partition by l.country
                              order by count(*) desc) drn
          from      location l
               , user_info u
               , post_table p
               , tags_table t
          where      l.location_id = u.location_id
               and p.user_id=u.user_id
               and p.post_id=t.post_id
          group by l.country
               , t.tags
where drn <=1   -- rank depends on like 1,2 or 3 popular tags for each countryRegards
Anurag

Pure SQL of Select query on multiple tables in DB Adapter

I am trying use pure sql approach for a custom sql query on multiple tables for a DB adapter by modifying toplink_mappings.xml. But i am not getting other tables in my xsd. Please help.

hi Ravi,
can you pls be a bit clear? what is this about? where you are using?
thanks,
sneha.

Executing the SQL query across 2 different databases of Oracle

Hello All,
In Microsoft SQL server we can execute following type of SQL query across 2 different databases:
select * from TEST1.dbo.GENERIC_TABLE1 union select * from TEST2.dbo.GENERIC_TABLE2;
Here TEST1 and TEST2 are 2 different databases.
Can we do the same in Oracle?

yes you can, but first one has to setup a database link
Look up CREATE DATABASE LINK and then take things from there!
P;

BaseTableName blank when calling GetSchema on a query with multiple tables

I am using ODP.NET 11.2.0.3.0 and when calling GetSchemaTable on a DataReader that contains a join the returned SchemaTable has the BaseTableName and BaseColumnName fields blank - this is different than what I see with the Oracle OLE DB Provider and with how SQL Server's native provider works. I can't find any discussion of this - is this on purpose or is it a bug? why does the available schema information vary so drastically between a single table query and a query with multiple tables joined?
Thanks,
Bryan Hinton

Hi Bryan,
I am also facing the same issue. Did u find any work around or any suggestions will be well appreciated.
Thanks,
Naresh.

Can't write right sql query by two tables

Hello
Everyone,
I am trying to get a sql query by two tables,
table:container
<pre class="jive-pre">
from_dest_id     number
ship_from_desc     varchar
to_dest_id     number
</pre>
table: label_fromat (changeless)
<pre class="jive-pre">
SORT_ORDER     number
PREFIX     varchar2
VARIABLE_NAME varchar2
SUFFIX varchar2
LF_COMMENT varchar2
</pre>
the sql which i need is
a. table CONTAINER 's each column should have LABLE_FORMAT 's PREFIX before and SUFFIX back ,and these columns is connected
example : the query output should be like this :
<pre class="jive-pre">
PREFIX||from_dest_id||SUFFIX ||PREFIX||ship_from_desc||SUFFIX ||PREFIX|| to_dest_id||SUFFIX
</pre>
every PREFIX and SUFFIX are come from LABEL_FORMAT's column VARIABLE_NAME (they are different)
column SORT_ORDER decide the sequence, for the example above: Column from_dest_id order is 1, ship_from_desc is 2,to_dest_id is 3
b. table LABEL_FORMAT's column VARIABLE_NAME have values ('from_dest_id','ship_from_desc','to_dest_id')
If table CONTAINER only have one record i can do it myself,
But actually it is more than one record,I do not know how to do
May be this should be used PL/SQL,or a Function ,Cursor ,Procedure
I am not good at these
Any tips will be very helpful for me
Thanks
Saven

Hi, Saven,
Presenting data from multiple rows as a single string is called String Aggregation . This page:
http://www.oracle-base.com/articles/10g/StringAggregationTechniques.php
shows many ways to do it, suited to different requirements, and different versions of Oracle.
In Oracle 10 (and up) you can do this:
SELECT     REPLACE ( SYS_CONNECT_BY_PATH ( f.prefix || ' '
                               || CASE f.variable_name
                                    WHEN 'FROM_DEST_ID'
                                   THEN from_dest_id
                                   WHEN 'SHIP_FROM_DESC'
                                   THEN ship_from_desc
                                   WHEN 'TO_DEST_ID'
                                   THEN to_dest_id
                                  END
                               || ' '
                               || f.suffix
                           , '~?'
          , '~?'
          )     AS output_txt
FROM          container     c
CROSS JOIN     label_format     f
WHERE          CONNECT_BY_ISLEAF     = 1
START WITH     f.sort_order     = 1
CONNECT BY     f.sort_order     = PRIOR f.sort_order + 1
     AND     c.from_dest_id     = PRIOR c.from_dest_id
saven wrote:If table CONTAINER only have one record i can do it myself,
But actually it is more than one record,I do not know how to do In that case, why did you post an example that only has one row in container?
The query above assumes
something in container (I used from_dest_id in the example above) is unique,
you don't mind having a space after prefix and before from_dest_id,
you want one row of output for every row in container, and
you can identify some string ('~?' in the example above) that never occurs in the concatenated data.

Single result set across multiple tables

Hi - what's the best way to perform a single query that can pull
a single result set across multiple tables, ie., a master table
containing subject details and child table containing multiple
records with detail.
I know how to do this for two columns in the same table via
indexing, but how about across tables?
Cheers,
John

I am not sure if I understood your question, but you can use
Intermedia Text with USER_DATA_STORE to create an index with data
source from multiple tables.
(see technet.oracle.com -> products -> oracle text)
Thomas

Inserting records across multiple tables

I'm still pretty new to working with databases, but have been
fine using DW to use forms to add, edit and delete records from a
flat table.
I'm less sure about updating records across multiple tables,
for example in a one to many rleationship with a look up table, eg
If I have three tables
Companies :
CompanyID (INT, auto increment)
Company
Address
etc
Contacts :
ContactID (INT, auto increment)
FirstName
LastName
etc
CompanyContacts :
CompanyID (INT)
ContactID (INT)
It's straightforward enough to create pages to insert new
records into the Companies or Contacts tables, but how do I go
about populating the CompanyContacts table when I add a new record
in the Contacts table, so that it becomes 'attached' to a
particular 'Company'?
If that makes sense.
Iain

I'm still pretty new to working with databases, but have been
fine using DW to use forms to add, edit and delete records from a
flat table.
I'm less sure about updating records across multiple tables,
for example in a one to many rleationship with a look up table, eg
If I have three tables
Companies :
CompanyID (INT, auto increment)
Company
Address
etc
Contacts :
ContactID (INT, auto increment)
FirstName
LastName
etc
CompanyContacts :
CompanyID (INT)
ContactID (INT)
It's straightforward enough to create pages to insert new
records into the Companies or Contacts tables, but how do I go
about populating the CompanyContacts table when I add a new record
in the Contacts table, so that it becomes 'attached' to a
particular 'Company'?
If that makes sense.
Iain

Finding the Text of SQL Query causing Full Table Scans

Hi,
does anyone have a sql script, that shows the complete sql text of queries that have caused a full table scan?
Please also let me know as to how soon this script needs to be run, in the sense does it work only while the query is running or would it work once it completes (if so is there a valid duration, such as until next restart, etc.)
Your help is appreciated.
Thx,
Mayuran

Finding the Text of SQL Query Causing Full Table Scan

Dbms_xmlgen.newcontext query from multiple tables and ||

I have two questions
How do I get a dbms_xmlgen.context to query from multiple tables? I have been able to make it work with using one table only, but not with multiple tables.
And how to get the || (concat) to work within my query for my output to an xml file?
Here is my current query:
create or replace function get_xml return clob is
result clob;
qryctx dbms_xmlgen.ctxHandle;
SELECT DBMS_XMLGEN.getxml('select prefix, suffix, fiscal_yr
FROM rcv.recv_accessions ra
where ra.prefix = 8 and ra.fiscal_yr = 11')xml into result FROM dual;
result := DBMS_XMLGEN.getXML(qryCtx);
This is what I desire:
SELECT DBMS_XMLGEN.getxml('select ra.prefix||'-'|| ra.suffix||'-'|| ra.fiscal_yr accession, ss.date_in, st.test
FROM rcv.recv_accessions ra, ser.sero_samples ss, ser.sero_tests st
where ra.prefix = 8 and ra.fiscal_yr = 11 and ss.raid = ra.id and st.ssid = ss.id')xml into result FROM dual;
On this both the reference to multiple tables and the concat function cause errors.
Thank you
Edited by: user583094 on Mar 2, 2011 3:36 PM

Hi,
for the concat do I use xmlconcat?No, XMLConcat is used to concatenate XMLType fragments.
The || operator will do fine, but you must escape any single quote inside the string :
SELECT DBMS_XMLGEN.getxml(
'SELECT ra.prefix ||''-''|| ra.suffix ||''-''|| ra.fiscal_yr as accession,
        ss.date_in,
        st.test
FROM rcv.recv_accessions ra,
      ser.sero_samples ss,
      ser.sero_tests st
WHERE ra.prefix = 8
AND ra.fiscal_yr = 11
AND ss.raid = ra.id
AND st.ssid = ss.id'
INTO result
FROM dual;Or, use the quoting operator to define a custom string delimiter :
SELECT DBMS_XMLGEN.getxml(
q'{SELECT ra.prefix ||'-'|| ra.suffix ||'-'|| ra.fiscal_yr as accession,
        ss.date_in,
        st.test
FROM rcv.recv_accessions ra,
      ser.sero_samples ss,
      ser.sero_tests st
WHERE ra.prefix = 8
AND ra.fiscal_yr = 11
AND ss.raid = ra.id
AND st.ssid = ss.id
INTO result
FROM dual;BTW, a good practice would be to use bind variables for the query. DBMS_XMLGEN can handle them nicely :
CREATE OR REPLACE FUNCTION get_xml
RETURN CLOB
IS
qryctx   DBMS_XMLGEN.ctxHandle;
v_out    CLOB;
qrystr   VARCHAR2(4000) :=
'SELECT ra.prefix ||''-''|| ra.suffix ||''-''|| ra.fiscal_yr as accession,
        ss.date_in,
        st.test
FROM rcv.recv_accessions ra,
      ser.sero_samples ss,
      ser.sero_tests st
WHERE ra.prefix = :b_prefix
AND ra.fiscal_yr = :b_fiscal_yr
AND ss.raid = ra.id
AND st.ssid = ss.id';
BEGIN
qryctx := DBMS_XMLGEN.newContext(qrystr);
DBMS_XMLGEN.setBindValue(qryctx, 'b_prefix', '8');
DBMS_XMLGEN.setBindValue(qryctx, 'b_fiscal_yr', '11');
-- to generate empty elements if necessary :
DBMS_XMLGEN.setNullHandling(qryctx, DBMS_XMLGEN.EMPTY_TAG);
v_out := DBMS_XMLGEN.getXML(qryctx);
DBMS_XMLGEN.closeContext(qryctx);
RETURN v_out;
END;

How to display multiple tables from database using netbeans swing gui

plz reply asap on how to display multiple tables from database using netbeans swing gui into the same project

Layered Pane with JTables or you can easily to it with a little scripting and HTML.
plzzzzzzzzzzzzzzzzz, do not use SMS speak when posting.

Modifying datatype of columns across multiple tables

Hi,
I have a requirement where-in I have to modify the datatypes of columns across multiple tables. Is there any direct way to do this? I mean does oracle has any function or in-built functionality to achieve this.
Example;
Table1 -> col1 datatype needs to be changed to varchar2(10)
Table2 -> col2 datatype needs to be changed to varchar2(30)
Table3 -> col3 datatype needs to be changed to number.
and so on....
Do we have such functionality?
Thanks,
Ishan

Hi Aman,
Seeing the replies, I think I was unclear in the requirements. But I guess you understood it fully, but still I would like to restate my question once again, just to be 100% sure.
What I actually want is that in one shot, I would be able to modify columns of multible tables.
eg, table1-> col1 changed to varchar2(20);
table2->col2 changed to varchar2(10)
table3-> col3 changed to number;
I know how to do it individually, but just wanted to check, if only one command can modify the datatypes of multiple tables/.
If not, I have already written half the script, but just for knowledge sake wanted to check if some feature is available in oracle for that.
Regards,
Ishan

Sql query across multiple tables ina database

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