【DataBase】SQL优化案例：其一

原始SQL:

这里想做的事情就是查询一周的一个计算值

可以理解为报表的那种

主表 t_wechat_clue 生产库上200万数据量

然后需要联表一些限制条件

SELECT
IFNULL(SUM((CASE WHEN CLUE.gen_date = DATE_ADD(CURRENT_DATE,INTERVAL -6 DAY) AND HOUR(CLUE.gen_time) = 22 THEN CLUE.follow_total ELSE 0 END)),0) AS y1,
IFNULL(SUM((CASE WHEN CLUE.gen_date = DATE_ADD(CURRENT_DATE,INTERVAL -5 DAY) AND HOUR(CLUE.gen_time) = 22 THEN CLUE.follow_total ELSE 0 END)),0) AS y2,
IFNULL(SUM((CASE WHEN CLUE.gen_date = DATE_ADD(CURRENT_DATE,INTERVAL -4 DAY) AND HOUR(CLUE.gen_time) = 22 THEN CLUE.follow_total ELSE 0 END)),0) AS y3,
IFNULL(SUM((CASE WHEN CLUE.gen_date = DATE_ADD(CURRENT_DATE,INTERVAL -3 DAY) AND HOUR(CLUE.gen_time) = 22 THEN CLUE.follow_total ELSE 0 END)),0) AS y4,
IFNULL(SUM((CASE WHEN CLUE.gen_date = DATE_ADD(CURRENT_DATE,INTERVAL -2 DAY) AND HOUR(CLUE.gen_time) = 22 THEN CLUE.follow_total ELSE 0 END)),0) AS y5,
IFNULL(SUM((CASE WHEN CLUE.gen_date = DATE_ADD(CURRENT_DATE,INTERVAL -1 DAY) AND HOUR(CLUE.gen_time) = 22 THEN CLUE.follow_total ELSE 0 END)),0) AS y6,
IFNULL(SUM((CASE WHEN CLUE.gen_date = DATE_ADD(CURRENT_DATE,INTERVAL 0 DAY)  AND HOUR(CLUE.gen_time) > HOUR(DATE_ADD(NOW(), INTERVAL -2 HOUR)) THEN CLUE.follow_total ELSE 0 END)),0) AS y7,

IFNULL(SUM(DISTINCT CASE WHEN CLUE.org_code IS NOT NULL THEN (CASE WHEN CLUE.gen_date = DATE_ADD(CURRENT_DATE,INTERVAL -6 DAY) AND HOUR(CLUE.gen_time) = 22 THEN CLUE.dist_total ELSE 0 END) ELSE 0 END), 0) AS a1,
IFNULL(SUM(DISTINCT CASE WHEN CLUE.org_code IS NOT NULL THEN (CASE WHEN CLUE.gen_date = DATE_ADD(CURRENT_DATE,INTERVAL -5 DAY) AND HOUR(CLUE.gen_time) = 22 THEN CLUE.dist_total ELSE 0 END) ELSE 0 END), 0) AS a2,
IFNULL(SUM(DISTINCT CASE WHEN CLUE.org_code IS NOT NULL THEN (CASE WHEN CLUE.gen_date = DATE_ADD(CURRENT_DATE,INTERVAL -4 DAY) AND HOUR(CLUE.gen_time) = 22 THEN CLUE.dist_total ELSE 0 END) ELSE 0 END), 0) AS a3,
IFNULL(SUM(DISTINCT CASE WHEN CLUE.org_code IS NOT NULL THEN (CASE WHEN CLUE.gen_date = DATE_ADD(CURRENT_DATE,INTERVAL -3 DAY) AND HOUR(CLUE.gen_time) = 22 THEN CLUE.dist_total ELSE 0 END) ELSE 0 END), 0) AS a4,
IFNULL(SUM(DISTINCT CASE WHEN CLUE.org_code IS NOT NULL THEN (CASE WHEN CLUE.gen_date = DATE_ADD(CURRENT_DATE,INTERVAL -2 DAY) AND HOUR(CLUE.gen_time) = 22 THEN CLUE.dist_total ELSE 0 END) ELSE 0 END), 0) AS a5,
IFNULL(SUM(DISTINCT CASE WHEN CLUE.org_code IS NOT NULL THEN (CASE WHEN CLUE.gen_date = DATE_ADD(CURRENT_DATE,INTERVAL -1 DAY) AND HOUR(CLUE.gen_time) = 22 THEN CLUE.dist_total ELSE 0 END) ELSE 0 END), 0) AS a6,
IFNULL(SUM(DISTINCT CASE WHEN CLUE.org_code IS NOT NULL THEN (CASE WHEN CLUE.gen_date = DATE_ADD(CURRENT_DATE,INTERVAL 0 DAY)  AND HOUR(CLUE.gen_time) > HOUR(DATE_ADD(NOW(), INTERVAL -2 HOUR)) THEN CLUE.dist_total ELSE 0 END) ELSE 0 END), 0) AS a7
        FROM
t_wechat_clues CLUE
JOIN t_dms_member DMS_MEMBER ON CLUE.emp_id = DMS_MEMBER.employee_id AND LENGTH(CLUE.org_code)=8 AND SUBSTR(CLUE.org_code, 1, 1)='P'
JOIN t_wechat_member WC_MEMBER ON DMS_MEMBER.wechat_emp_id = WC_MEMBER.userid AND WC_MEMBER.STATUS = 1 AND WC_MEMBER.TYPE = 2
JOIN (SELECT TT.id ,TT.NAME   FROM (
        WITH RECURSIVE cte AS(
                SELECT a.id, a.parent_id,a.name FROM tt_wechat_org a WHERE a.id='49'
                UNION ALL
                SELECT k.id, k.parent_id,k.name FROM tt_wechat_org k INNER JOIN cte c ON c.id = k.parent_id
        ) SELECT id,NAME,parent_id FROM cte) TT ) TREE_ORG ON TREE_ORG.id = WC_MEMBER.department

反正实际上数据返回到页面渲染Echarts花了10秒的样子

经理说8行，必须要改动

前提情况是，这里联表的字段和日期时间都做了索引处理

慢的原因是查询的字段导致

另外还有就是联表的字段数据类型需要一致

不要让MySQL去推导转换，这会浪费一部分性能

优化之后：

随后同事给我一套UnionALL解法，虽然SQL很多，但是效率提升明显！

SELECT
    IFNULL(SUM(CLUE.follow_total),0) AS y1 ,
     SUM(DISTINCT (CASE WHEN  CLUE.org_code IS NOT NULL THEN CLUE.dist_total ELSE 0 END))  a1
FROM
t_wechat_clues CLUE
JOIN t_dms_member DMS_MEMBER ON CLUE.emp_id = DMS_MEMBER.employee_id AND LENGTH(CLUE.org_code)=8 AND SUBSTR(CLUE.org_code, 1, 1)='P'
 JOIN t_wechat_member WC_MEMBER ON DMS_MEMBER.wechat_emp_id = WC_MEMBER.userid  AND WC_MEMBER.STATUS = 1 AND WC_MEMBER.TYPE = 2
 JOIN (SELECT TT.id ,TT.NAME   FROM (
        WITH RECURSIVE cte AS(
                SELECT a.id, a.parent_id,a.name FROM tt_wechat_org a WHERE a.id='49'
                UNION ALL
                SELECT k.id, k.parent_id,k.name FROM tt_wechat_org k INNER JOIN cte c ON c.id = k.parent_id
        ) SELECT id,NAME,parent_id FROM cte) TT ) TREE_ORG ON TREE_ORG.id = WC_MEMBER.department
  WHERE CLUE.gen_date = DATE_ADD(CURRENT_DATE,INTERVAL -6 DAY)  AND HOUR(CLUE.gen_time) = 22
  UNION ALL 

SELECT
    IFNULL(SUM(CLUE.follow_total),0) AS y1 ,
     SUM(DISTINCT (CASE WHEN  CLUE.org_code IS NOT NULL THEN CLUE.dist_total ELSE 0 END))  a1
FROM
t_wechat_clues CLUE
JOIN t_dms_member DMS_MEMBER ON CLUE.emp_id = DMS_MEMBER.employee_id AND LENGTH(CLUE.org_code)=8 AND SUBSTR(CLUE.org_code, 1, 1)='P'
 JOIN t_wechat_member WC_MEMBER ON DMS_MEMBER.wechat_emp_id = WC_MEMBER.userid  AND WC_MEMBER.STATUS = 1 AND WC_MEMBER.TYPE = 2
 JOIN (SELECT TT.id ,TT.NAME   FROM (
        WITH RECURSIVE cte AS(
                SELECT a.id, a.parent_id,a.name FROM tt_wechat_org a WHERE a.id='49'
                UNION ALL
                SELECT k.id, k.parent_id,k.name FROM tt_wechat_org k INNER JOIN cte c ON c.id = k.parent_id
        ) SELECT id,NAME,parent_id FROM cte) TT ) TREE_ORG ON TREE_ORG.id = WC_MEMBER.department
  WHERE CLUE.gen_date = DATE_ADD(CURRENT_DATE,INTERVAL -5 DAY)  AND HOUR(CLUE.gen_time) = 22

    UNION ALL 

SELECT
    IFNULL(SUM(CLUE.follow_total),0) AS y1 ,
     SUM(DISTINCT (CASE WHEN  CLUE.org_code IS NOT NULL THEN CLUE.dist_total ELSE 0 END))  a1
FROM
t_wechat_clues CLUE
JOIN t_dms_member DMS_MEMBER ON CLUE.emp_id = DMS_MEMBER.employee_id AND LENGTH(CLUE.org_code)=8 AND SUBSTR(CLUE.org_code, 1, 1)='P'
 JOIN t_wechat_member WC_MEMBER ON DMS_MEMBER.wechat_emp_id = WC_MEMBER.userid  AND WC_MEMBER.STATUS = 1 AND WC_MEMBER.TYPE = 2
 JOIN (SELECT TT.id ,TT.NAME   FROM (
        WITH RECURSIVE cte AS(
                SELECT a.id, a.parent_id,a.name FROM tt_wechat_org a WHERE a.id='49'
                UNION ALL
                SELECT k.id, k.parent_id,k.name FROM tt_wechat_org k INNER JOIN cte c ON c.id = k.parent_id
        ) SELECT id,NAME,parent_id FROM cte) TT ) TREE_ORG ON TREE_ORG.id = WC_MEMBER.department
  WHERE CLUE.gen_date = DATE_ADD(CURRENT_DATE,INTERVAL -4 DAY)  AND HOUR(CLUE.gen_time) = 22

    UNION ALL 

SELECT
    IFNULL(SUM(CLUE.follow_total),0) AS y1 ,
     SUM(DISTINCT (CASE WHEN  CLUE.org_code IS NOT NULL THEN CLUE.dist_total ELSE 0 END))  a1
FROM
t_wechat_clues CLUE
JOIN t_dms_member DMS_MEMBER ON CLUE.emp_id = DMS_MEMBER.employee_id AND LENGTH(CLUE.org_code)=8 AND SUBSTR(CLUE.org_code, 1, 1)='P'
 JOIN t_wechat_member WC_MEMBER ON DMS_MEMBER.wechat_emp_id = WC_MEMBER.userid  AND WC_MEMBER.STATUS = 1 AND WC_MEMBER.TYPE = 2
 JOIN (SELECT TT.id ,TT.NAME   FROM (
        WITH RECURSIVE cte AS(
                SELECT a.id, a.parent_id,a.name FROM tt_wechat_org a WHERE a.id='49'
                UNION ALL
                SELECT k.id, k.parent_id,k.name FROM tt_wechat_org k INNER JOIN cte c ON c.id = k.parent_id
        ) SELECT id,NAME,parent_id FROM cte) TT ) TREE_ORG ON TREE_ORG.id = WC_MEMBER.department
  WHERE CLUE.gen_date = DATE_ADD(CURRENT_DATE,INTERVAL -3 DAY)  AND HOUR(CLUE.gen_time) = 22

    UNION ALL 

SELECT
    IFNULL(SUM(CLUE.follow_total),0) AS y1 ,
     SUM(DISTINCT (CASE WHEN  CLUE.org_code IS NOT NULL THEN CLUE.dist_total ELSE 0 END))  a1
FROM
t_wechat_clues CLUE
JOIN t_dms_member DMS_MEMBER ON CLUE.emp_id = DMS_MEMBER.employee_id AND LENGTH(CLUE.org_code)=8 AND SUBSTR(CLUE.org_code, 1, 1)='P'
 JOIN t_wechat_member WC_MEMBER ON DMS_MEMBER.wechat_emp_id = WC_MEMBER.userid  AND WC_MEMBER.STATUS = 1 AND WC_MEMBER.TYPE = 2
 JOIN (SELECT TT.id ,TT.NAME   FROM (
        WITH RECURSIVE cte AS(
                SELECT a.id, a.parent_id,a.name FROM tt_wechat_org a WHERE a.id='49'
                UNION ALL
                SELECT k.id, k.parent_id,k.name FROM tt_wechat_org k INNER JOIN cte c ON c.id = k.parent_id
        ) SELECT id,NAME,parent_id FROM cte) TT ) TREE_ORG ON TREE_ORG.id = WC_MEMBER.department
  WHERE CLUE.gen_date = DATE_ADD(CURRENT_DATE,INTERVAL -2 DAY)  AND HOUR(CLUE.gen_time) = 22

    UNION ALL 

SELECT
    IFNULL(SUM(CLUE.follow_total),0) AS y1 ,
     SUM(DISTINCT (CASE WHEN  CLUE.org_code IS NOT NULL THEN CLUE.dist_total ELSE 0 END))  a1
FROM
t_wechat_clues CLUE
JOIN t_dms_member DMS_MEMBER ON CLUE.emp_id = DMS_MEMBER.employee_id AND LENGTH(CLUE.org_code)=8 AND SUBSTR(CLUE.org_code, 1, 1)='P'
 JOIN t_wechat_member WC_MEMBER ON DMS_MEMBER.wechat_emp_id = WC_MEMBER.userid  AND WC_MEMBER.STATUS = 1 AND WC_MEMBER.TYPE = 2
 JOIN (SELECT TT.id ,TT.NAME   FROM (
        WITH RECURSIVE cte AS(
                SELECT a.id, a.parent_id,a.name FROM tt_wechat_org a WHERE a.id='49'
                UNION ALL
                SELECT k.id, k.parent_id,k.name FROM tt_wechat_org k INNER JOIN cte c ON c.id = k.parent_id
        ) SELECT id,NAME,parent_id FROM cte) TT ) TREE_ORG ON TREE_ORG.id = WC_MEMBER.department
  WHERE CLUE.gen_date = DATE_ADD(CURRENT_DATE,INTERVAL -1 DAY)  AND HOUR(CLUE.gen_time) = 22

    UNION ALL 

SELECT
    IFNULL(SUM(CLUE.follow_total),0) AS y1 ,
     SUM(DISTINCT (CASE WHEN  CLUE.org_code IS NOT NULL THEN CLUE.dist_total ELSE 0 END))  a1
FROM
t_wechat_clues CLUE
JOIN t_dms_member DMS_MEMBER ON CLUE.emp_id = DMS_MEMBER.employee_id AND LENGTH(CLUE.org_code)=8 AND SUBSTR(CLUE.org_code, 1, 1)='P'
 JOIN t_wechat_member WC_MEMBER ON DMS_MEMBER.wechat_emp_id = WC_MEMBER.userid  AND WC_MEMBER.STATUS = 1 AND WC_MEMBER.TYPE = 2
 JOIN (SELECT TT.id ,TT.NAME   FROM (
        WITH RECURSIVE cte AS(
                SELECT a.id, a.parent_id,a.name FROM tt_wechat_org a WHERE a.id='49'
                UNION ALL
                SELECT k.id, k.parent_id,k.name FROM tt_wechat_org k INNER JOIN cte c ON c.id = k.parent_id
        ) SELECT id,NAME,parent_id FROM cte) TT ) TREE_ORG ON TREE_ORG.id = WC_MEMBER.department
  WHERE CLUE.gen_date = DATE_ADD(CURRENT_DATE,INTERVAL -0 DAY)  AND HOUR(CLUE.gen_time) > HOUR(DATE_ADD(NOW(), INTERVAL -2 HOUR))

生产库执行结果是909ms 1秒差点就查完了