mySQL : 语法错误“您的 SQL 语法有误；请查看与您的 MySQL 服务器版本对应的手册以了解正确的语法

Question

我正在尝试从两个子集执行外部左连接，对结果进行排序，然后将其注入现有的 table（追加）。我不明白为什么它是 unacceptable SQL 查询：

INSERT INTO f_grades ( tenant_code, 
                       effective_date, 
                       member_id, 
                       segment_code, 
                       ps_grade 
                      )
(
 SELECT TT.*
 FROM (
       SELECT T.tenant_code as tenant_code,
              COALESCE(T.effective_date, CURRENT_DATE()) as effective_date,
              T.member_id as member_id,
              T.segment_code as segment_code,
              T.ps_grade as ps_grade
       FROM (
               (
                 SELECT tenant_code, 
                        member_id, 
                        segment_code
                 FROM f_grades
                 WHERE effective_date = ( select MAX(DATE(effective_date)) from f_grades )
                  ) as A
                    LEFT OUTER JOIN
                (
                  SELECT partner_member_id, 
                         effective_date, 
                         ps_grade
                  FROM touchpoint.PT_Flags
                 ) as B  on A.member_id = B.partner_member_id
             ) as T
      ) as TT
);

输出错误：

[2021-12-09 22:38:42] [42000][1064] (conn=1151) 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 'T
[2021-12-09 22:38:42] [42000][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 'T
[2021-12-09 22:38:42] ) as TT
[2021-12-09 22:38:42] )' at line 15

can please someone advise?

Answer 1

我认为您不需要那些子查询。您可以直接连接两个表。

INSERT INTO f_grades (tenant_code, effective_date, member_id, segment_code, ps_grade)
 SELECT A.tenant_code                              as tenant_code,
        COALESCE(B.effective_date, CURRENT_DATE()) as effective_date,
        T.member_id                                as member_id,
        T.segment_code                             as segment_code,
        B.ps_grade                                 as ps_grade
 FROM f_grades A
 LEFT OUTER JOIN touchpoint.PT_Flags B
   ON A.member_id = B.partner_member_id
 WHERE effective_date = (select MAX(DATE(effective_date)) from f_grades)

mySQL : 语法错误“您的 SQL 语法有误；请查看与您的 MySQL 服务器版本对应的手册以了解正确的语法

mySQL : Syntax Error "You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to

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