过程比较来自不同表的两列并进行插入

Question

我有两张桌子：

1. 项目字段为fld_id（整数），fld_allocated_hours（整数），fld_project_id（整数）
2. TIMESHEET，字段为fld_id（整数），fld_allocated_time（整数），fld_project_id（整数）

我有这个程序：

CREATE PROCEDURE sp_insert_allocated_time(p_project_id integer, p_allocated_time integer)
  RETURNS void 
  AS
BEGIN   
INSERT INTO dbo.Timesheet(fld_id, fld_project_id,fld_allocated_time)
from
(
  SELECT p.fld_id, p.fld_allocated_hours t.fld_allocated_time
  FROM dbo.Project p
  INNER JOIN dbo.Timesheet t
  ON p.fld_id=t.fld_id
  where t.fld_project_id = p_project_id
)AS Alias
GROUP BY fld_id, fld_allocated_days, fld_allocated_time
having SUM(fld_allocated_time) < fld_allocated_hours;
END;

我想制作这个程序：

1. 从参数fld_project_id
中的表Timesheet中插入allocated_time
2. 检查表Timesheet中的SUM（fld_allocated_time）列是否小于或等于表Project中的fld_allocated_hours。
3. 发出插入或错误消息或退出

Answer 1

您可以使用IF ... ELSE块来检查条件并根据条件的结果执行适当的操作。为此，您需要将SUM（fld_allocated_time）和fld_allocated_hours的结果存储到变量中，然后：

IF @sumResult <= @allocatedTime 
BEGIN
--do some stuff
END
ELSE
BEGIN
--do some other stuff
END