Question

在MySQL工作台中执行此SQL语句时遇到问题。谁能指出我的问题？

SELECT concat(LocationName,' - ', StationName) AS LocationStation, EmpName AS '0000-0100', EmpName AS '0100-0200', EmpName AS '0200-0300', EmpName AS '0300-0400', EmpName AS '0400-0500', EmpName AS '0500-0600', EmpName AS '0600-0700', EmpName AS '0700-0800', EmpName AS '0800-0900', EmpName AS '0900-1000', EmpName AS '1000-1100', EmpName AS '1100-1200', FROM satsschema.employeeslot
WHERE LocationName = 'T2 PML'
and AllocationDate = '10-Aug' 
and (EmpTime >= '00:00:00' and EmpTime <= '12:00:00')

上面的状态提示我这个错误，“你的SQL语法有错误，请查看与你的MySQL服务器版本对应的手册，使用正确的语法来使用整齐的'FROM satsschema.employeeslot WHERE LocationName ='T2 PML'和AllocationDate ='在第1行。“

其次，除了输入所有内容之外，还有其他方法可以缩短这条线吗？

EmpName AS '0000-0100', EmpName AS '0100-0200', EmpName AS '0200-0300', EmpName AS '0300-0400', EmpName AS '0400-0500', EmpName AS '0500-0600', EmpName AS '0600-0700', EmpName AS '0700-0800', EmpName AS '0800-0900', EmpName AS '0900-1000', EmpName AS '1000-1100', EmpName AS '1100-1200', FROM satsschema.employeeslot

非常感谢帮助。

Answer 1

删除FROM之前的逗号。它会导致错误。

SELECT concat(LocationName,' - ', StationName) AS LocationStation, EmpName AS '0000-0100', EmpName AS '0100-0200', EmpName AS '0200-0300', EmpName AS '0300-0400', EmpName AS '0400-0500', EmpName AS '0500-0600', EmpName AS '0600-0700', EmpName AS '0700-0800', EmpName AS '0800-0900', EmpName AS '0900-1000', EmpName AS '1000-1100', EmpName AS '1100-1200' FROM satsschema.employeeslot
WHERE LocationName = 'T2 PML'
and AllocationDate = '10-Aug' 
and (EmpTime >= '00:00:00' and EmpTime <= '12:00:00')

请注意，错误消息确切地说明错误在哪里。

在MySQL中，AS关键字对于列别名是可选的，因此您可以用EmpName '0000-0100'代替EmpName AS '0000-0100'。我不认为有一个简短的解决方案可以为一个列提供多个别名，因为它通常不是必需的。

Answer 2

在comma子句之前删除额外的from。

SELECT  concat(LocationName,' - ', StationName) AS LocationStation, 
        EmpName AS '0000-0100', 
        EmpName AS '0100-0200', 
        EmpName AS '0200-0300', 
        EmpName AS '0300-0400', 
        EmpName AS '0400-0500', 
        EmpName AS '0500-0600',
        EmpName AS '0600-0700', 
        EmpName AS '0700-0800', 
        EmpName AS '0800-0900', 
        EmpName AS '0900-1000', 
        EmpName AS '1000-1100',
        EmpName AS '1100-1200'   -- remove comma here
FROM satsschema.employeeslot
WHERE LocationName = 'T2 PML'
and AllocationDate = '10-Aug' 
and (EmpTime >= '00:00:00' and EmpTime <= '12:00:00')

带别名（AS）的MySQL查询中的SQL错误

2 个答案: