MySQL选择其中列不为空的地方
在 MySQL 中，我可以只选择存在某些内容的列吗?
In MySQL, can I select columns only where something exists?
例如，我有以下查询:
select phone, phone2
from jewishyellow.users
where phone like '813%'
and phone2
我正在尝试仅选择 phone 以 813 开头且 phone2 中包含某些内容的行.
I'm trying to select only the rows where phone starts with 813 and phone2 has something in it.
推荐答案
比较phone2的值与空字符串:
select phone, phone2
from jewishyellow.users
where phone like '813%' and phone2<>''
请注意，NULL 值被解释为 false.
Note that NULL value is interpreted as false.
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