Question

我有一个查询。我将两个列值添加到一个派生列，然后我想从派生列和已存在的列中获取差异。但是我得到了一些未知的列错误

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任何人都知道可能出现的问题？

Answer 1

如果您要查找特定amount和pending

的fee和st_id

然后

SELECT  
    `st_id` ,  
    `fee` , 
    SUM(  `total` ) AS total, 
    SUM(  `books` ) AS book,
    SUM(  `uniform` ) AS uniform,
    SUM(  `total` + `books` + `uniform` ) AS amount,
    SUM(  `total` + `books` + `uniform` - `paid` ) AS pending
FROM  `fee_tbl` 
WHERE  `st_id` IN ( 40, 504, 533, 640, 817, 944 ) 
GROUP BY  `fee` ,  `st_id`

或

SELECT  
    `st_id` ,  
    `fee` , 
    SUM(  `total` ) AS total, 
    SUM(  `books` ) AS book,
    SUM(  `uniform` ) AS uniform,
    SUM(  `total` ) + SUM(  `books` ) + SUM(  `uniform` ) AS amount,
    SUM(  `total` ) + SUM(  `books` ) + SUM(  `uniform` ) - SUM(`paid` ) AS pending
FROM  `fee_tbl` 
WHERE  `st_id` IN ( 40, 504, 533, 640, 817, 944 ) 
GROUP BY  `fee` ,  `st_id`

与sql中派生列的区别

1 个答案: