ANSI SQL-92 standard comments (--) and C++ standard comments (/*...*/, //) are supported. Comments can be nested.

For example, in the following query columns col2, col3, and col4 are ignored:

SELECT col1  /* col1 comment */
/*
    col2,-- col2 comment
    col3,// col3 comment
    col4,/* col4 comment */
*/
FROM t1