SQL: COALESCE, ELT and JOIN in an INSERT statement
INSERT 2 values into a new table user_registration_meta, take the data from the users and rep_sessions tables.
ELT picks a random value from $active_reps = 1,2,3,4,5,6.
Because it's a JOIN on an INSERT statement the values in the SELECT parts have to be the same name as the columns you want to insert, here it's user_id and rep_id.
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INSERT INTO user_registration_meta (user_id,rep_id) SELECT users.id AS user_id, COALESCE(rs.rep_id,elt(floor(rand() * $array_length + 1), $active_reps ),0) AS rep_id FROM users LEFT JOIN rep_sessions rs ON users.id=rs.user_id WHERE brand_id= $brandid GROUP BY users.id ORDER BY max(rs.end_date);
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