Question

I’d like to execute a line of INSERT, but only when an if condititonal is true.

Here’s a basic example (just to simplify the question) in psuedo code.

"If there is a user id = 5 in the users table (using SELECT), execute: INSERT INTO someOtherTable ... ()"

Any help is greatly appreciated.

Answer 1

if users.id is primary key or at least unique

INSERT INTO someOtherTable
SELECT 123, 456, 'a string value'
FROM users
WHERE id = 5

for non unique test you can use the special table DAUL

INSERT INTO someOtherTable
SELECT 123, 456, 'a string value'
FROM DUAL
WHERE 5 IN (SELECT id FROM users WHERE id = 5)