WHERE 子句中的逻辑锁

Question

由于 FUNCCODE 在 POSCODE 和 DEVCODE 之间共享，因此我不能同时调用两者来消除空值以将数据插入到名为 JOINT 的单独表中。 POSCODE 和 DEVCODE 是 FK。我知道必须有一种更简单的方法来做到这一点。在过去的两周里，我试图制定一个解决方案......感觉就像我不明白要完成这项工作的一件事。任何建议表示赞赏。

表设置

FUNCCODE | POSCODE | DEVCODE

    11        1       NULL
    12       NULL      1
    13        2       NULL 
    14       NULL      2

该表需要重新排列，然后插入到一个名为 JOINT 的单独表中，该表设置为：

POSCODE | POSFUNCCODE |DEVCODE | DEVFUNCCODE

   1          11          1         12
   2          13          2         14

我的一些尝试 XD

每个连接只创建我需要的 2 列

SELECT 
    dbo.POSITION.POSCODE AS POSCODE, 
    dbo.FUNC.FUNCCODE AS POSFUNCCODE
FROM FUNC
INNER JOIN POSITION ON dbo.POSITION.POSCODE = dbo.FUNC.POSCODE 

UNION ALL

SELECT 
    dbo.DEVICE.DEVCODE AS DEVCODE,
    dbo.FUNC.FUNCCODE AS DEVFUNCCODE
FROM FUNC
INNER JOIN DEVICE ON dbo.DEVICE.DEVCODE = dbo.FUNC.DEVCODE 
ORDER BY 1;

只插入最后一行的值

DECLARE @DATE DATETIME = GETDATE()

DECLARE @PC INT;

SELECT @PC = POSCODE 
FROM func
WHERE poscode != 0 
ORDER BY 1;

DECLARE @FCP INT;

SELECT @FCP = FUNCCODE 
FROM FUNC
WHERE POSCODE != 0 
ORDER BY 1;

DECLARE @DC INT;

SELECT @DC = devcode 
FROM func
WHERE devcode != 0
ORDER BY 1;

DECLARE @FCD INT

SELECT @FCD = FUNCCODE 
FROM FUNC
WHERE DEVCODE != 0
ORDER BY 1

INSERT INTO JOINT (POSCODE, POSFUNCCODE, DEVCODE, DEVFUNCCODE, JOINTTIME,             
JOINTSTATUS)
VALUES (@PC, @FCP, @DC, @FCD, @DATE, 1)

Answer 1

如果我对您的问题的理解是正确的，我认为以下查询将是一个解决方案。

INSERT INTO JOINT (POSTCODE, DEVCODE, POSFUNCCODE, DEVFUNCCODE)
SELECT
POSTCODE,
    DEVCODE,
    MAX(CASE
    WHEN POSCODE IS NOT NULL THEN FUNCCODE
    ELSE NULL
END) POSFUNCCODE,
MAX(CASE
    WHEN DEVCODE IS NOT NULL THEN FUNCCODE
    ELSE NULL
END) DEVFUNCCODE
FROM FUNC
GROUP BY POSTCODE,DEVCODE

更好理解后的第二个版本

INSERT INTO JOINT (POSTCODE, DEVCODE, POSFUNCCODE, DEVFUNCCODE)
SELECT
   t1.POSTCODE,
   t2.DEVCODE,
   t1.POSFUNCCODE,
   t2.DEVFUNCCODE
(SELECT
  POSTCODE,
  MAX(CASE
        WHEN POSCODE IS NOT NULL THEN FUNCCODE
        ELSE NULL
    END) POSFUNCCODE
FROM FUNC
GROUP BY POSTCODE) t1
INNER JOIN
(SELECT
  DEVCODE,
  MAX(CASE
        WHEN DEVCODE IS NOT NULL THEN FUNCCODE
        ELSE NULL
END) DEVFUNCCODE
FROM FUNC
GROUP BY DEVCODE) t2
ON t1.POSTCODE = t2.DEVCODE

Answer 2

根据我更好的判断，我创建了一个循环来插入正确的值....我知道这不是解决此问题的正确方法，请原谅我，因为我在 SQL 方面的经验很少。但这更正了客户端程序中的接口问题。向@user4219031 寻求指导！

DECLARE @DATE DATETIME = GETDATE()

DECLARE @PC INT = 0;

DECLARE  @FCP INT = 12;

DECLARE @DC INT = 0;

DECLARE @FCD INT = 13

WHILE ( @PC < 739 )
BEGIN 
    INSERT INTO JOINT (POSCODE, POSFUNCCODE, DEVCODE, DEVFUNCCODE, JOINTTIME, JOINTSTATUS)
   VALUES( @PC, @FCP, @DC, @FCD, @DATE, 1)
    SET @PC = @PC + 1
    SET @FCP = @FCP +2 
    SET @DC = @DC + 1
    SET @FCD = @FCD + 2

END 

Answer 3

编辑：我将查询更改为考虑 NULL POSCODE 或 DEVCODE。

SQL Fiddle

MS SQL Server 2017 架构设置：

CREATE TABLE t ( FUNCCODE int, POSCODE int,  DEVCODE int ) ;

INSERT INTO t (FUNCCODE, POSCODE, DEVCODE)
VALUES 
    ( 11, 1, NULL )
  , ( 12, NULL, 1 )
  , ( 13, 2, NULL )
  , ( 14, NULL, 2 )
  , ( 42, NULL, 1 )
  , ( 77, NULL, 7 )
  , ( 88, NULL, 8 )
  , ( 99, 9, NULL )
; 

创建新表并插入记录

CREATE TABLE ti ( POSCODE int, pos_FUNCCODE int, DEVCODE int, dev_FUNCCODE int ) ;

INSERT INTO ti ( POSCODE, pos_FUNCCODE, DEVCODE, dev_FUNCCODE)
SELECT t1.POSCODE
  , t1.FUNCCODE AS pos_FUNCODE
  , t2.DEVCODE
  , t2.FUNCCODE AS dev_FUNCCODE 
FROM t t1
FULL OUTER JOIN t t2 ON t1.POSCODE = t2.DEVCODE
WHERE t1.POSCODE IS NOT NULL OR t2.DEVCODE IS NOT NULL

;

新表中有什么？：

SELECT * FROM ti 

Results：

| POSCODE | pos_FUNCCODE | DEVCODE | dev_FUNCCODE |
|---------|--------------|---------|--------------|
|       1 |           11 |       1 |           12 |
|       1 |           11 |       1 |           42 |
|       2 |           13 |       2 |           14 |
|       9 |           99 |  (null) |       (null) |
|  (null) |       (null) |       7 |           77 |
|  (null) |       (null) |       8 |           88 |

==========原创==========

SQL Fiddle

MS SQL Server 2017 架构设置：

CREATE TABLE t ( FUNCCODE int, POSCODE int,  DEVCODE int ) ;

INSERT INTO t (FUNCCODE, POSCODE, DEVCODE)
VALUES 
    ( 11, 1, NULL )
  , ( 12, NULL, 1 )
  , ( 13, 2, NULL )
  , ( 14, NULL, 2 )
; 

创建新表并插入记录

CREATE TABLE ti ( POSCODE int, pos_FUNCCODE int, DEVCODE int, dev_FUNCCODE int ) ;

INSERT INTO ti ( POSCODE, pos_FUNCCODE, DEVCODE, dev_FUNCCODE)
SELECT t1.POSCODE
  , t1.FUNCCODE AS pos_FUNCODE
  , t2.DEVCODE
  , t2.FUNCCODE AS dev_FUNCCODE 
FROM t t1
INNER JOIN t t2 ON t1.POSCODE = t2.DEVCODE
WHERE t1.POSCODE IS NOT NULL
;

新表中有什么？：

SELECT * FROM ti 

Results：

| POSCODE | pos_FUNCCODE | DEVCODE | dev_FUNCCODE |
|---------|--------------|---------|--------------|
|       1 |           11 |       1 |           12 |
|       2 |           13 |       2 |           14 |