查询在mysql上运行，但是放入Query Checker时失败

Question

CREATE TABLE T1(client_id int, Loancount int, PRIMARY KEY (client_id));


INSERT INTO  T1(client_id, Loancount)
SELECT DISTINCT C.client_id, count(loan_id) as LoanCount
FROM CLIENT  as C, DISP as D, LOAN as L
WHERE (C.client_id=D.client_id) AND (D.account_id=L.account_id)
group by  C.client_id;

CREATE TABLE T2 (client_id int, Trancount int, PRIMARY KEY (client_id));
INSERT INTO  T2(client_id, Trancount)
(SELECT DISTINCT C.client_id, count(trans_id) as Trancount
FROM CLIENT  as C, DISP as D, TRANSACTION as T
WHERE (C.client_id=D.client_id) AND (D.account_id=T.account_id)
group by  C.client_id) ;


SELECT DISTINCT T1.client_id, IF(Trancount>=LoanCount,Trancount,LoanCount) as Maxcount
FROM T1,T2
WHERE T1.client_id=T2.client_id;

DROP Table T1;
DROP Table T2;

[当我尝试在此处运行此查询（https://www.eversql.com/sql-syntax-check-validator/）时，它说周围存在错误。插入T1。该代码虽然编译。

错误消息：“您的SQL语法有错误；似乎该错误在周围：'在第6行中，INSERT INTO T1（client_id，Loancount）SELECT DISTINCT C.client_id，count（lo'）”

Answer 1

您是否一次将所有查询粘贴到查询检查器？它很可能一次只接受一个查询。

您可以对单个查询执行相同的操作。不需要表（在这种情况下，您应该使用临时表）：

SELECT q.client_id, IF(max(q.Trancount)>=max(q.LoanCount),max(q.Trancount),max(q.LoanCount))
FROM (
  SELECT C.client_id, 0 as LoanCount, count(T.trans_id) as Trancount
  FROM CLIENT C, 
    JOIN DISP D ON D.client_id=C.client_id
    JOIN TRANSACTION T ON T.account_id=D.account_id
  group by  C.client_id
  UNION
  SELECT C.client_id, count(L.loan_id) as LoanCount, 0 as Trancount
  FROM CLIENT C, 
    JOIN DISP D ON D.client_id=C.client_id
    JOIN LOAN as L ON L.account_id=D.account_id
  group by  C.client_id
) as q
group by  Q.client_id