如果 WHERE 子句上的其他
我有这个查询:
SELECT `id` , `naam`
FROM `klanten`
WHERE (
`email` LIKE '%@domain.nl%'
OR `email2` LIKE '%@domain.nl%'
)
但我想做这样的事情:
SELECT `id` , `naam`
FROM `klanten`
WHERE IF(`email` > 0,
`email` LIKE '%@domain.nl%'
, `email2` LIKE '%@domain.nl%'
)
如何检查电子邮件是否存在?我想使用电子邮件,如果此字段为空,我想使用 email2.我该如何实现?
How to check if email exist? I want to use email and if this field is empty I want to use email2. How do I accomplish this?
推荐答案
IF
用于选择字段,然后将 LIKE
子句放在其后面:>
IF
is used to select the field, then the LIKE
clause is placed after it:
SELECT `id` , `naam`
FROM `klanten`
WHERE IF(`email` != '', `email`, `email2`) LIKE '%@domain.nl%'
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