[英]IfNull function in mysql doesnt seem to work for me
mysql中的IfNull函数似乎对我不起作用...。当我执行此查询时
select t1.dAccHeader_id,t1.dAccHeaderName,t1.dAccHeaderAcronym,
t2.dDesignationName as incharge1,
t3.dDesignationName as incharge2,t4.dDesignationName as incharge3
from tbl_accountheader as t1
inner join tbl_designation_master as t2 on t2.dDesignation_id = t1.dPaymentIncharge_1
inner join tbl_designation_master as t3 on t3.dDesignation_id = ifnull(t1.dPaymentIncharge_2,'0')
inner join tbl_designation_master as t4 on t4.dDesignation_id = ifnull(t1.dPaymentIncharge_3,'0')
and t1.dCollege_id='1'
and t1.dIsDelete='0'
这是我的桌子
任何建议...
您可以尝试使用coalesce
功能
inner join tbl_designation_master as t3
on t3.dDesignation_id = coalesce(t1.dPaymentIncharge_2,'0')
如果您的ID是数字,则也可以删除引号 :
coalesce(t1.dPaymentIncharge_2, 0)
还要检查您的t1.dPaymentIncharge_1
可以为null
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