/ from empupd a , emp b * ERROR at line 4: ORA-00933: SQL command not properly ended Elapsed: .00 Thanks Regards Ajay K.
parent directory dating affiliate site alertpay - Updating multiple columns in oracle
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We could then use that convenience to build a statement that updates multiple columns at a time.
So, you may not always encounter a situation where this convenience occurs, but it's here if you need it.
All INSTEAD OF triggers are fired for each row and you cannot narrow down the event by column.
Instead you can check to see what columns are updated in the body of the trigger by using the UPDATING ('column_name') clause.
I have one table A has column (id, field_1,field_2), and another table B has column (id,field_2) Now I want to merge table B to A, that means i want to update field_2 in table A to value of table B. BTW I am using oracle Thanks Now, each time the above is executed, it will do it across all rows in the table.
If this is something you need to do all the time, I would suggest something else, but for a one-off or very small tables it should be sufficient.
@a_horse_with_no_name: Oracle does not directly support the JOIN keyword in an UPDATE, but it allows UPDATE involving JOIN operations between table in at least 2 different ways, look at the accepted answer here: stackoverflow.com/questions/2446764/…
You could create a trigger on table B that updates table A every time field_2 on table B is updated.
create table Employee( 2 ID VARCHAR2(4 BYTE) NOT NULL, 3 First_Name VARCHAR2(10 BYTE), 4 Last_Name VARCHAR2(10 BYTE), 5 Start_Date DATE, 6 End_Date DATE, 7 Salary Number(8,2), 8 City VARCHAR2(10 BYTE), 9 Description VARCHAR2(15 BYTE) 10 ) 11 / Table created.