Question

I have a .sql file with some update queries.

What i am looking for is when an update query fails, i should be able to execute another update query

e.g. Update table1 set col1="zbc" where id=1;
suppose above query fails as “id=1” was not found.

Then i want to execute below query to do update on another table:

Update table2 set col1="zbc" where id=1;

Since i want this to go in .sql file, I am looking for a single query to achieve this using if/case statement or something similar.

Answer 1

What if just run the second query and check if these rows exist in the first table for example:

Update table1 set col1="zbc" where id=1;
Update table2 set col1="zbc" where id=1 
                             and not exists (select id from table1 where id=1);

or use ROW_COUNT() MySql function and IF. It returns the number of rows changed, deleted, or inserted by the last statement.