SQL错误-子查询后跟=，！=，<，<=，>，> =或将子查询用作表达式时，不允许这样做
[英]Error in SQL - This is not permitted when the subquery follows =, !=, <, <= , >, >= or when the subquery is used as an expression
问题描述
I am trying to update a field based on two conditions 
我正在尝试根据两个条件更新字段
UPDATE TABLE1 SET FIELD1 = (SELECT SUBSTRING(LEFT(FIELD2,3),2,2) FROM TABLE1) WHERE FIELD2 LIKE '0%' AND FIELD3 IN ('OK','YES')
UPDATE TABLE1 SET FIELD1 = (SELECT SUBSTRING(LEFT(FIELD2,3),1,2) FROM TABLE1) WHERE FIELD2 NOT LIKE '0%' AND FIELD3 IN ('OK','YES')
Field1 has numbers that begin with 0 and 1. If it begins with 0 then updates the first query. Field1的数字以0和1开头。如果以0开头，则更新第一个查询。 If 1 then second query 如果为1，则第二个查询
1 个解决方案
解决方案1
1 已采纳 2014-09-18 12:18:33
You don't need the subqueries. 您不需要子查询。 All you need is: 所有你需要的是：
UPDATE TABLE1
SET FIELD1 = SUBSTRING(LEFT(FIELD2,3),2,2)
WHERE FIELD2 LIKE '0%'
AND FIELD3 IN ('OK','YES')
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