SORT BY CASE IF 语句

如何解决SORT BY CASE IF 语句

这是我尝试过的。当应该有很多结果时，我得到零结果。任何帮助将不胜感激！

这是订购代码：

ORDER BY category ASC,CASE WHEN Business_Zip IN 'Certified_Zips' THEN Search_Order WHEN Business_Zip NOT IN 
'Certified_Zips' THEN Search_Order_2 END ASC,Referrals DESC,Business_Name,Login,id ASC";

这是整个查询：

"SELECT * FROM DATA" WHERE Zip_Radius LIKE '%$zipradius%' AND category NOT 
LIKE '$category' AND category NOT LIKE '$category2' AND category NOT LIKE 
'$category3' 

AND category2 NOT LIKE '$category' AND category2 NOT LIKE ('$category2' AND 
category2 != '') AND category2 NOT LIKE ('$category3' AND category3 != '')


AND category3 NOT LIKE '$category' AND category3 NOT LIKE ('$category2' AND 
category2 != '') AND category3 NOT LIKE ('$category3' AND category3 != '')

ORDER BY category ASC,CASE WHEN Business_Zip IN 'Cerified_Zips' THEN Search_Order ELSE Business_Zip 
NOT IN 'Certified_Zips' 
THEN Search_Order_2 END ASC,id ASC";

$result = $conn->query($sql);

if ($result->num_rows > 0) {

while($row = $result->fetch_assoc()) {
echo "stuff....";
}
} else {
echo "no results";
}}

$conn->close();

解决方法

您的“按代码订购”与“整个查询”代码不匹配。你有第二个“WHEN”还是“ELSE”？如果你有一个 ELSE，我认为它后面不能跟一个“NOT IN”/“THEN”。如果您有第二个 WHEN，我建议将其替换为“ELSE Search_Order_2 END”。

编辑：结合@Akina 的评论，我同意 Order By 不能影响返回的行数。因此，您的代码中可能有错误。建议用 ELSE 代替第二个 WHEN。

EDIT2：看到更多代码，我会尝试按以下方式修改它：

"SELECT * FROM DATA WHERE Zip_Radius LIKE '%$zipradius%' AND category NOT 
LIKE '$category' AND category NOT LIKE '$category2' AND category NOT LIKE 
'$category3' 

AND category2 NOT LIKE '$category' AND category2 NOT LIKE '$category2' AND 
category2 != '' AND category2 NOT LIKE '$category3' AND category3 != ''


AND category3 NOT LIKE '$category' AND category3 NOT LIKE '$category2' AND 
category2 != '' AND category3 NOT LIKE '$category3' AND category3 != ''

ORDER BY category ASC,CASE WHEN Business_Zip IN 'Cerified_Zips' THEN Search_Order ELSE Search_Order_2 END ASC,Referrals DESC,Business_Name,Login,id ASC";

,

首先感谢大家的帮助！非常感谢。

这结束了对我和我的情况的工作。希望以后能帮到其他人：

    SELECT * FROM DATA WHERE Zip_Radius LIKE '%$zipradius%' AND category NOT LIKE '$category' AND category NOT LIKE '$category2' AND category NOT LIKE '$category3' 

AND category2 NOT LIKE '$category' AND category2 NOT LIKE ('$category2' AND category2 != '') AND category2 NOT LIKE ('$category3' AND category3 != '')


AND category3 NOT LIKE '$category' AND category3 NOT LIKE ('$category2' AND category2 != '') AND category3 NOT LIKE ('$category3' AND category3 != '')

ORDER BY category ASC,CASE WHEN Business_Zip LIKE '$Seal_Zips' THEN Search_Order ELSE Search_Order_2 END 
ASC,id ASC