SQL语句中的if函数使用,如果满足一个件条可以赋一个需要的值,方便代码判断 eg:
SELECT *,if(ebay_excludecountrymodel.id is null,'false','true') checked
FROM ebay_exshiplocation e left join ebay_excludecountrymodel
on e.site=ebay_excludecountrymodel.site
and e.id= ebay_excludecountrymodel.excludecountryid
and ebay_excludecountrymodel.site=186 where e.site=186;
SELECT `user`.realname, if(`user`.realname IS NULL , '有值' ,'无') checked
from user LEFT JOIN user_other_info ON `user`.id=user_other_info.id
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sql 语句if函数
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