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在 MySQL 工作台中执行此 SQL 语句时遇到问题。谁能为我指出问题？

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')

上面的语句提示我这个错误，“您的 SQL 语法有错误，请查看与您的 MySQL 服务器版本相对应的手册以获取正确的语法以使用整洁的 '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，还有其他方法可以使这条线更短吗？

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

帮助将不胜感激。

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2 回答 2

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去掉前面的逗号FROM。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，错误消息准确地说明了错误在哪里。

在 MySQL 中，该AS关键字对于列别名是可选的，因此您可以EmpName '0000-0100'使用EmpName AS '0000-0100'. 我认为没有一个简短的解决方案可以为一列提供多个别名，因为这实际上并不是经常需要的。

于 2012-08-29T06:28:48.177 回答
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删除额外的commabeforefrom子句。

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')
于 2012-08-29T06:33:37.117 回答