Question

错误在哪里？

SELECT * FROM papiry 
WHERE (aktivni=1 AND pocetovereni>1 ORDER BY pocetovereni DESC LIMIT1) 
AND oddeleni='$oddeleni' ORDER BY nazev ASC;

感谢您的帮助，我不擅长SQL。

Answer 1

您的SQL不正确，ORDER BY不是要在WHERE子句中输入的子句。潜在的好SQl看起来像这样：

SELECT * FROM papiry 
WHERE aktivni=1 
AND pocetovereni>1 
AND oddeleni='$oddeleni' 
ORDER BY ORDER BY pocet, overeni DESC, nazev ASC;

但是，您必须决定要按哪个列排序。这是在SQL命令结束时定义的。

Answer 2

SELECT * 
FROM papiry 
WHERE (aktivni = 1 AND pocetovereni > 1) 
AND oddeleni='$oddeleni' 
ORDER BY 
     CASE WHEN ktivni = 1 AND pocetovereni > 1 THEN pocetovereni END DESC,
     CASE WHEN oddeleni='$oddeleni' THEN nazev END ASC

Answer 3

Order By必须出现在WHERE子句之后，这至少可以在SQL Server中使用：

SELECT * FROM papiry 
WHERE aktivni=1 AND pocetovereni>1 AND oddeleni='$oddeleni' 
ORDER BY pocetovereni DESC, nazev ASC

SQL子查询错误

3 个答案: