Question

我在网上搜索过，但没有找到任何完全符合我需要的东西。我有两个非常相似的表，除了一列。以下是表格：

TABLE case_cards

CC_Primary_Num | CC_Num | Fac_ID_Num | Surg_Proc_Num | Fac_Equip_ID_Num |
---------------|--------|------------|---------------|------------------|
         1     |  10001 |     1      |       2       |        4         |
         2     |  10002 |     2      |       3       |        7         |        
         3     |  10002 |     2      |       3       |        2         |
         4     |  10003 |     5      |       7       |        1         |

TABLE case_cards_prep

CC_Control_Num | CC_Prep_Num | Book_Num | Fac_ID_Num | Surg_Proc_Num | Fac_Equip_ID_Num |
---------------|-------------|----------|------------|---------------|------------------|
         1     |      1      |     1    |     1      |       2       |        9         |
         2     |      2      |     2    |     2      |       3       |        3         |        
         3     |      2      |     2    |     2      |       3       |        5         |
         4     |      3      |     1    |     1      |       2       |        8         |

是否可以使用Select语句，我可以根据case_cards_prep表中Book_Num的可用性来提取一行或多行，如果是，则为相应Book_Num的最大CC_Prep_Num。如果Book_Num不在case_cards_prep中，请从case_cards表中提取Surg_Proc_Num的记录？我还在学习，这个有点过头了。例如：

IF case_card_prep.Book_Num = 2 然后选择所有行最大值（CC_Prep_Num）

ELSE选择所有行其中Surg_Proc_Num = 3

（显然不是mysql语法，但你应该明白......我希望）

结果表

Fac_ID_Num | Surg_Proc_Num | Fac_Equip_ID_Num |
-----------|---------------|------------------|
     2     |        3      |         3        |
     2     |        3      |         5        |

OR

结果表 - 如果不是case_cards_prep

Fac_ID_Num | Surg_Proc_Num | Fac_Equip_ID_Num |
-----------|---------------|------------------|
     5     |        7      |         1        |

Answer 1

这是你想要的吗？

SELECT Fac_ID_Num, MAX(CC_Prep_Num), Fac_Equip_ID_Num 
  FROM case_cards_prep 
  GROUP BY Book_Num 
UNION 
SELECT Fac_ID_Num, Surg_Proc_Num, Fac_Equip_ID_Num 
  FROM case_cards 
  WHERE Fac_ID_Num NOT IN (SELECT Fac_ID_Num FROM case_cards_prep )

Answer 2

尝试使用以下内容根据您的预订编号选择记录。

  --Create Table case_cards (CC_Primary_Num int, CC_Num int, Fac_ID_Num int, 
Surg_Proc_Num int, Fac_Equip_ID_Num int)
--Create Table case_cards_prep (CC_Control_Num int, CC_Prep_Num int, Book_Num int, Fac_ID_Num int, Surg_Proc_Num int, Fac_Equip_ID_Num int)
--Delete From case_cards
--Insert Into case_cards
--Select 1, 10001, 1,2,4 Union
--Select 2, 10002, 2,3,7 Union
--Select 3, 10002, 2,3,2 Union
--Select 4, 10003, 5,7,1

--Delete From case_cards_prep
--Insert Into case_cards_prep
--Select 1, 1, 1, 1, 2, 9 Union
--Select 2, 2, 2, 2, 3, 3 Union
--Select 3, 2, 2, 2, 3, 5 Union
--Select 4, 3, 1, 1, 2, 8
Create PROCEDURE dbo.GetCaseCards --Stored Proc
    @BookNum int = 0 --This is a Variable
AS
--Declare @BookNum int
Declare @CountBook int
Declare @Max int

--Drop Table #Results
Create Table #Results (Fac_ID_Num int, Surg_Proc_Num int, Fac_Equip_ID_Num int)


Select @CountBook = Count(*) From case_cards_prep Where Book_Num = @BookNum
--Select @CountBook
if(@CountBook > 0) 
Begin
    Select @Max = Max(Surg_Proc_Num) From case_cards_prep
    Insert Into #Results
    Select Fac_ID_Num, Surg_Proc_Num, Fac_Equip_ID_Num From case_cards_prep Where Surg_Proc_Num = @Max

End
if(@CountBook = 0) 
Begin
    Insert Into #Results
    Select Fac_ID_Num, Surg_Proc_Num, Fac_Equip_ID_Num From case_cards Where Right(CC_Num,1) = @BookNum

End

Select * From #Results

使用以下方法执行该过程：

Exec GetCaseCards 2
Exec GetCaseCards 3

MySQL有条件地从两个表中选择

2 个答案: