SELECT INTO and “Undeclared variable” error

Question

When I try to execute following query:

SELECT id_subscriber
  INTO newsletter_to_send
  FROM subscribers 

I get an error:

Answer 1

MySQL Server doesn't support the SELECT ... INTO TABLE Sybase SQL extension. Instead, MySQL Server supports the INSERT INTO ... SELECT standard SQL syntax, which is basically the same thing. See Section 12.2.5.1, “INSERT ... SELECT Syntax”.

Ref:- this