[英]How to use result set of one sub query in other sub query
我有以下mysql查詢:
SELECT
ec.id,
ec.name,
gecr.Group_Id,
(SELECT
COUNT(DISTINCT c.ID)
FROM containers c
WHERE c.group_id IN (
SELECT g.ID AS Group_id FROM (group_master g)
INNER JOIN group_user_reln gur ON g.ID = gur.group_id
WHERE gur.user_id = 91))
AS group_count
FROM
exam_category ec
INNER JOIN
group_exam_category_reln gecr ON gecr.Exam_category_Id = ec.ID
WHERE
ec.InActive_YN = 'N'
AND gecr.Group_Id IN
(SELECT g.ID AS Group_id FROM (group_master g)
INNER JOIN group_user_reln gur ON g.ID = gur.group_id
WHERE gur.user_id = 91)
GROUP BY ec.id
ORDER BY ec.name asc
在上面的查詢中,如何使用子查詢僅獲取一次組ID?
將變量聲明為表格
DECLARE @ids TABLE (id INT)
用數據填充該表
INSERT INTO @ids SELECT g.ID AS Group_id FROM (group_master g)
在查詢中使用它。 這是TSQL語法,但在MySql中應類似地工作。
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