如何修复SQL查询错误

Question

我有这个要求

 DELETE FROM T1 WHERE PERMISSION_ID = 'x' AND 
 0<(SELECT * FROM T2 WHERE "SUBSTR"(PID,1,1)=1)  OR '1'='1'

但是得到了

The SQL statement " DELETE FROM T1 WHERE PERMISSION_ID = 'x' 
AND 0<(SELECT * FROM T2 WHERE SUBSTR(PID,1,1)=1)  OR '1'='1'" 
contains the syntax error[s]: - 1:101 - SQL syntax error: the token 
"(" was not expected here

请帮忙，我该如何解决？

---

UPDATE将“ SUBSTR”删除为SUBSTR，但获取SQL语句

DELETE FROM T1 
WHERE PERMISSION_ID = 'x' 
AND 0= (SELECT * FROM T2 WHERE SUBSTR(PID,1,1)=1)  OR '1'='1'

包含语法错误：-1:99-SQL语法错误：此处不应该使用标记“（”

---

更新2

我改为

SELECT count(*) FROM T2 WHERE SUBSTRING("asdqweasd",1,1))

并获得-SQL语法错误：此处不期望标记“，”-期望“来自”，发现为“，”

Answer 1

您不需要在SUBSTR周围使用双引号。 您也不能使用SELECT *。 使用次数（*）

DELETE FROM T1 WHERE PERMISSION_ID = 'x' AND 
 0<(SELECT count(*) FROM T2 WHERE SUBSTR(PID,1,1)=1)  OR '1'='1'