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PraveenM
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Asked: 2016-06-18T10:49:48+03:00 In:

How can i Update a table by data in another table ?

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i want to update my table with data in another table in oracle sql for example
Table 1:

ID    NAME         DESC
---------------------------
1     mac          first
2     donald       second
3     robert       third

 

Table 2:

ID    NAME        DESC
-----------------------
3     SALAH       forth
5     AHMED       fifth

 

so now i want to run sql update statement to update table 1 by data located in table 2 which is two table are equals in ID’s, so the final result would be like this

ID    NAME         DESC
---------------------------
1     mac          first
2     donald       second
3     SALAH        forth

thanks in advance.

databaseoraclesqlstatementupdate
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    1 Answer

    1. Hassan AbdElrahman
      Master Oracle ACE Pro ♠ | Oracle Senior ERP Technical Consultant

      This called correlated update you can find examples below

      UPDATE TABLE(<SELECT STATEMENT>) <alias1>
SET <column_1> = (
  SELECT <column_1>
  FROM <table_2> <alias2>
  WHERE <alias2.table_name> = <alias1.table_name>);

      in you sample :

      UPDATE table1 t1
   SET (name, desc) = (SELECT t2.name, t2.desc
                         FROM table2 t2
                        WHERE t1.id = t2.id)
 WHERE EXISTS (
    SELECT 1
      FROM table2 t2
     WHERE t1.id = t2.id )

      alternative way you can do this

      UPDATE (SELECT t1.id, 
               t1.name name1,
               t1.desc desc1,
               t2.name name2,
               t2.desc desc2
          FROM table1 t1,
               table2 t2
         WHERE t1.id = t2.id)
   SET name1 = name2,
       desc1 = desc2

      and now the final example is

      UPDATE Table1 T1 SET
T1.name = (SELECT T2.name FROM Table2 T2 WHERE T2.id = T1.id),
T1.desc = (SELECT T2.desc FROM Table2 T2 WHERE T2.id = T1.id)
WHERE T1.id IN (SELECT T2.id FROM Table2 T2 WHERE T2.id = T1.id);

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