MYSQL insert after sub query with count

Question

I'm trying to INSERT some data into a table but only when the subquery COUNT is > 0.

This is what I have so far.

INSERT INTO users_friends (userId, friendId) VALUES (77, 100) 
WHERE 
(SELECT COUNT(id) FROM users WHERE email = '[e-mail]') > 0

Both queries work independently FYI.

This should be a simple fix hopefully. Cheers

Answer 1

Try this::

INSERT INTO users_friends (userId, friendId) 
(SELECT 77, 100  FROM users GROUP BY email HAVING email= '[e-mail]' and count(id)>0)

Answer 2

INSERT INTO users_friends (userId, friendId) 
SELECT 77, 100 FROM users WHERE email = '[e-mail]'
GROUP BY email
HAVING COUNT(id) > 0

Answer 3

SQLFiddle demo if there are records '[e-mail]'

SQLFiddle demo if there are NOT records '[e-mail]'

INSERT INTO users_friends (userId, friendId) 
SELECT 77, 100 
FROM users WHERE email = '[e-mail]' LIMIT 1;

Another way would be:

INSERT INTO users_friends (userId, friendId) 
SELECT 77, 100 
FROM dual
WHERE EXISTS
      ( SELECT * FROM users WHERE email = '[e-mail]' ) ;