在一个表视图中加入 3 个具有日期值的表

Question

我有 3 个表，两个表有日期列，一个只显示日期，

第一个表 - 第一个表用于设置当天交付的状态..

code    status  date
------  ------  ------
JHB        v    2017-12-26
JHB        v    2017-12-27
JHB        v    2017-12-28
JHB        v    2017-12-31
PEN        v    2017-12-26
PEN        v    2017-12-27
PEN        v    2017-12-28
PEN        v    2017-12-29

第二张表是针对每个代码位公共假期的

code    P.H         date
------  ------      ------
JHB     Chrismas    2017-12-25
PEN     Chrismas    2017-12-25

第三个表是每个代码周末假期

code    Holiday         
------  ------  
JHB     Friday
JHB     Saturday    
PEN     Saturday
PEN     Sunday  

那么如何生成如下表..

day      JHB    PEN
------  ------  ------
25       P.H    P.H
26        v      v
27        v      v
28        v      v
29        H      v
30        H      H
31        v      H

日期是从 12 月 25 日到 12 月 31 日的日期安排

v - 交付状态 H-假期 P.H - 公共假期

Answer 1

我使用递归 CTE 为列创建动态 SQL 查询。另外，我使用递归 CTE 来计算日期范围。对于最终结果，我加入了公共假期和状态表并按日期分组。 希望有帮助！！

Demo

EXEC(
'
-- Dynamic SQL to dynamically add the columns based on code
DECLARE @DynamicSQL VARCHAR(MAX);
DECLARE @FORMAT VARCHAR(100)= ''MAX(CASE WHEN src.code = ''''?'''' THEN COALESCE(src.status, ''''H'''') ELSE ''''H'''' END) AS ''''?'''''';
-- Populate Dynamic SQL
;WITH SDTable AS (
    SELECT ''JHB'' AS code, ''v'' AS status, CAST(''2017-12-26'' AS DATE) AS date UNION ALL
    SELECT ''JHB'', ''v'', CAST(''2017-12-27'' AS DATE) UNION ALL
    SELECT ''JHB'', ''v'', CAST(''2017-12-28'' AS DATE) UNION ALL
    SELECT ''JHB'', ''v'', CAST(''2017-12-31'' AS DATE) UNION ALL
    SELECT ''PEN'', ''v'', CAST(''2017-12-26'' AS DATE) UNION ALL
    SELECT ''PEN'', ''v'', CAST(''2017-12-27'' AS DATE) UNION ALL
    SELECT ''PEN'', ''v'', CAST(''2017-12-28'' AS DATE) UNION ALL
    SELECT ''PEN'', ''v'', CAST(''2017-12-29'' AS DATE)
),
PHTable AS (
    SELECT ''JHB'' AS code, ''Chrismas'' AS ''P.H'', CAST(''2017-12-25'' AS DATE) AS date UNION ALL
    SELECT ''PEN'', ''Chrismas'', CAST(''2017-12-25'' AS DATE)
),
WeekendTable AS (
    SELECT ''JHB'' AS code, ''Friday'' AS Holiday UNION ALL
    SELECT ''JHB'', ''Saturday'' UNION ALL
    SELECT ''PEN'', ''Saturday'' UNION ALL
    SELECT ''PEN'', ''Sunday''
),
DistinctCodeTable AS(
SELECT DISTINCT code FROM (SELECT code AS code FROM WeekendTable UNION ALL SELECT code AS code FROM PHTable UNION ALL SELECT code AS code FROM SDTable) codeTable
)
SELECT @DynamicSQL = 
    STUFF(( SELECT '','' + REPLACE(@FORMAT, ''?'', code) 
              FROM DistinctCodeTable
              FOR XML PATH('''')),1,1,'''');

-- Execute Main query with dynamic columns
EXEC(
-- Define Range
''DECLARE @D1 DATE = ''''2017-12-25'''';
DECLARE @D2 DATE = ''''2017-12-31'''';

;WITH SDTable AS (
    SELECT ''''JHB'''' AS code, ''''v'''' AS status, CAST(''''2017-12-26'''' AS DATE) AS date UNION ALL
    SELECT ''''JHB'''', ''''v'''', CAST(''''2017-12-27'''' AS DATE) UNION ALL
    SELECT ''''JHB'''', ''''v'''', CAST(''''2017-12-28'''' AS DATE) UNION ALL
    SELECT ''''JHB'''', ''''v'''', CAST(''''2017-12-31'''' AS DATE) UNION ALL
    SELECT ''''PEN'''', ''''v'''', CAST(''''2017-12-26'''' AS DATE) UNION ALL
    SELECT ''''PEN'''', ''''v'''', CAST(''''2017-12-27'''' AS DATE) UNION ALL
    SELECT ''''PEN'''', ''''v'''', CAST(''''2017-12-28'''' AS DATE) UNION ALL
    SELECT ''''PEN'''', ''''v'''', CAST(''''2017-12-29'''' AS DATE)
),
PHTable AS (
    SELECT ''''JHB'''' AS code, ''''Chrismas'''' AS ''''P.H'''', CAST(''''2017-12-25'''' AS DATE) AS date UNION ALL
    SELECT ''''PEN'''', ''''Chrismas'''', CAST(''''2017-12-25'''' AS DATE)
),
WeekendTable AS (
    SELECT ''''JHB'''' AS code, ''''Friday'''' AS Holiday UNION ALL
    SELECT ''''JHB'''', ''''Saturday'''' UNION ALL
    SELECT ''''PEN'''', ''''Saturday'''' UNION ALL
    SELECT ''''PEN'''', ''''Sunday''''
),
DistinctCodeTable AS(
SELECT DISTINCT code FROM (SELECT code AS code FROM WeekendTable UNION ALL SELECT code AS code FROM PHTable UNION ALL SELECT code AS code FROM SDTable) codeTable
),
L0 AS (SELECT 1 AS c UNION ALL SELECT 1),
L1 AS (SELECT 1 AS c FROM L0 A CROSS JOIN L0 B),
L2 AS (SELECT 1 AS c FROM L1 A CROSS JOIN L1 B),
L3 AS (SELECT 1 AS c FROM L2 A CROSS JOIN L2 B),
L4 AS (SELECT 1 AS c FROM L3 A CROSS JOIN L3 B),
Nums AS (SELECT ROW_NUMBER() OVER (ORDER BY (SELECT 0)) AS i FROM L4)
SELECT 
src.day AS day,'' 
+ @DynamicSQL +
''
FROM 
(
-- Select Public holiday as well as status table
SELECT
 CASE WHEN ph.[P.H] IS NOT NULL THEN ph.code ELSE sd.code END AS code,
 CASE WHEN ph.[P.H] IS NOT NULL THEN ''''P.H'''' ELSE CASE WHEN sd.status IS NOT NULL THEN sd.status ELSE ''''H'''' END
 END AS status,
 DATEPART(DAY, DATEADD(day,i-1,@D1)) AS day
 FROM Nums n
 LEFT JOIN SDTable sd ON sd.date = DATEADD(day,n.i-1,@D1)
 LEFT JOIN PHTable ph ON ph.date = DATEADD(day,n.i-1,@D1)
WHERE i <= 1+DATEDIFF(day,@D1,@D2)
) src
GROUP BY src.day;'')
');

输出

day      JHB    PEN
------  ------  ------
25       P.H    P.H
26        v      v
27        v      v
28        v      v
29        H      v
30        H      H
31        v      H