MYSQL - Group by limit

Question

Is there a simple way to LIMIT the GROUP BY results to the top 2. The following query returns all the results. Using \'LIMIT 2\' reduces the overall list to the top 2 entr

Answer 1

SUBSTRING_INDEX(
    GROUP_CONCAT(expr1 ORDER BY expr2 SEPARATOR ";"),
    ";",
    2  /* the GROUP_LIMIT */
)

expr1 can be like CONCAT(...). Involve REPLACE to hide any ";".