SQL SELECT和视觉多个AND查询语句C＃

Question

在这个查询语句我想在'datetime'列，其中emp_ID等于在textBox2选择emp_ID“和” leavetype = Fullday“和”status = approved天数量的总和。这是我的代码

string selectSql = 
"Select sum(datetime) 
From Lea_information 
Where emp_ID= ('" + textBox2.Text + "') 
and (leave_type,status) = values (Fullday,Approved)"; 

Answer 1

尝试这样

string selectSql = 
"Select sum(datetime) 
From Lea_information 
Where emp_ID= '" + textBox2.Text + "' 
AND leave_type ='Fullday' 
AND status = 'Approved'"; 

Answer 2

使用

ing selectSql = "Select sum(datetime) from Lea_information where emp_ID= ('" + textBox2.Text + "') and leave_type = FullDay and status = Approved)"; 

不知道你所使用的数据库，但我从来没有见过像语句您以前写在那里。