我想在我的select语句中使用子查询。类似于: (SELECT COUNT(*) FROM table2 WHERE a = '1') AS countsubquery, fielda,fieldb但是当子查询为空时,整个行将从结果中删除。有没有办法让结果是:fielda = filled在我的例子中,子<e
我有这个查询: CASE WHEN id IN (1,2,4) THEN 25 CASE WHEN owner = 25 THEN NULLEND as owner并得到这个错误:
You have an error in your SQL syntax; check the manual thatyour MySQL server version for the right syntax to use near '
我需要询问一下SQL Server 2005的奇怪行为。select * from Theme where BackgroundImageUrl like '%[%'select * from Theme wherelike '%[%'B select BackgroundImageUrl from Theme where BackgroundImageUrl like '%]%
我正在使用这个查询来获取带有价格的产品。select sku, price from products where sku in ('001', '002', '003'); 预期结果: { '002': 40,'003' : 0 // if the sku doesn't exit, want to set price 0
} 但是上面的查询只返回数据库中存在的
我在这一行得到一个SQL错误:$sql = "SELECT WO_NUM, PM_MECHANICAL, PM_APPLICATIONS, LINE_ITEM FROMSchedule WHERE PM_MECHANICAL IS NOT NULL AND WO_NUM <>";
该语句用于查询字段中PM_MECHANICAL有内容且WO_NUM为整数(字段中没有字母或字符