java - 如何对具有不同可能性的单个列的记录求和？

Question

我有一个 mysql 查询:

SELECT count(*) as `present_days` 
FROM  tbl_intime_status 
WHERE employee_status = 'Out' and 
      present_status = 'Full Day' and 
      date LIKE '%/"+month2+"/"+year1+"' and 
      employee_id="+ EmpId+

从这个查询我得到没有。 全天 出席。

我的数据库记录中有 present_status= 'Half Day' & present_status = 'Full Day'。

如何计算“全天”+“半天”？

Answer 1

如果你想把计数分开，你可以这样做

SELECT present_status, count(*) as `present_days` 
FROM  tbl_intime_status 
WHERE employee_status = 'Out' and 
      present_status IN ('Full Day','Half Day')
      date LIKE '%/"+month2+"/"+year1+"' and 
      employee_id="+ EmpId+
GROUP BY present_status

如果你想要两者的总和，那么就这样做

SELECT count(*) as `present_days` 
FROM  tbl_intime_status 
WHERE employee_status = 'Out' and 
      present_status IN ('Full Day','Half Day')
      date LIKE '%/"+month2+"/"+year1+"' and 
      employee_id="+ EmpId+