Asp.net 如何在SQL查询中测试空值
我尝试选择要更新的行,因此如何更改用户_分配的_项目='“+NULL+”Asp.net 如何在SQL查询中测试空值,asp.net,sql,database,Asp.net,Sql,Database,我尝试选择要更新的行,因此如何更改用户_分配的_项目='“+NULL+” 谢谢。使用为NULL非'=NULL' string query = "select User_name, User_Second_Choice from tbl_User where User_Assigned_Project ='"+NULL+"'"; select User_name, User_Second_Choice from tbl_User where User_Assigned_Proj
谢谢。使用为NULL非'=NULL'
string query =
"select User_name, User_Second_Choice
from tbl_User where User_Assigned_Project ='"+NULL+"'";
select User_name, User_Second_Choice
from tbl_User where User_Assigned_Project IS NULL