これは、コース データを取得する元の SQL ステートメントです。
SELECT
`courses`.`id` AS `id`,
`courses`.`title` AS `title`,
`courses`.`description` AS `description`,
MATCH (coursedata.title) AGAINST ('Salsa') * 5 + MATCH (coursedata.description) AGAINST ('Salsa') * 2 AS `relevance`,
GROUP_CONCAT(trainers.name SEPARATOR '|||') AS `trainers`
FROM `courses`
INNER JOIN `coursedata` ON `courses`.`id` = `coursedata`.`id`
INNER JOIN `courses_trainers` ON `courses`.`id` = `courses_trainers`.`course_id`
INNER JOIN `trainers` ON `trainer_id` = `trainers`.`id`
GROUP BY `courses`.`id`
HAVING `relevance` >= '3'
を使用してMySQL Extensions to GROUP BY
実行できないため、sql_mode
が に設定されている場合はONLY_FULL_GROUP_BY
、標準 SQL に準拠させる必要がありました。
SELECT * FROM (
SELECT
`courses`.`id` AS `id`,
`courses`.`title` AS `title`,
`courses`.`description` AS `description`,
MATCH (coursedata.title) AGAINST ('Salsa') * 5 + MATCH (coursedata.description) AGAINST ('Salsa') * 2 AS `relevance`
-- , GROUP_CONCAT(trainers.name SEPARATOR '|||') AS `trainers`
FROM `courses`
INNER JOIN `coursedata` ON `courses`.`id` = `coursedata`.`id`
LEFT JOIN `courses_trainers` ON `courses`.`id` = `courses_trainers`.`course_id`
LEFT JOIN `trainers` ON `trainer_id` = `trainers`.`id`
) AS subselect
WHERE `relevance` >= '3'
これは問題ありませんが、(複数のフィールドを 1 つのフィールド/文字列GROUP_CONCAT
に連結するために) 関数を使用できなくなりました。trainer
Error Code: 1064
You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'GROUP_CONCAT(trainers.name SEPARATOR '|||') AS `trainers`
FROM `courses`
INNER' at line 7
機能を使用する別の方法はありGROUP_CONCAT
ますか?