如何在T-SQL中访问列表中的值？
我有一个SQL语句循环并计算值在Table_1中的特定列中出现的次数。然后它将所需的值插入到Table_2的列中，或者如果该行不存在，则会添加一个新行并添加必要的数据。
我准确地创建了列表或表，
DECLARE @MyList TABLE (Value NVARCHAR(50))
INSERT INTO @MyList VALUES ('Data1')
INSERT INTO @MyList VALUES ('Data2')
INSERT INTO @MyList VALUES ('Data3')
INSERT INTO @MyList VALUES ('Data4')
INSERT INTO @MyList VALUES ('Data5')
INSERT INTO @MyList VALUES ('Data6')
INSERT INTO @MyList VALUES ('Data7')
INSERT INTO @MyList VALUES ('Data8')
该语句工作正常，但我有所有硬编码，我想添加一些动态数据插入，所以我创建了一个值列表（字符串）。现在我无法按照我的方式访问这些值。
这是整个陈述，
DECLARE @cnt INT = 1;
DECLARE @MyList TABLE (Value NVARCHAR(50))
INSERT INTO @MyList VALUES ('Data1')
INSERT INTO @MyList VALUES ('Data2')
INSERT INTO @MyList VALUES ('Data3')
INSERT INTO @MyList VALUES ('Data4')
INSERT INTO @MyList VALUES ('Data5')
INSERT INTO @MyList VALUES ('Data6')
INSERT INTO @MyList VALUES ('Data7')
INSERT INTO @MyList VALUES ('Data8')
WHILE @cnt < 9
BEGIN
IF EXISTS (SELECT * FROM Staff_Manager.dbo.Staff_Count_TBL WHERE Staff_No = 3201 AND Year_D = 2016 AND Month_D = 6 AND Column_Index = @cnt)
BEGIN
UPDATE Staff_Manager.dbo.Staff_Count_TBL
SET Column_Value = (
SELECT COUNT(*)
FROM Staff_Manager.dbo.Staff_Time_TBL
WHERE Staff_No = 3201 AND Date_Data BETWEEN '2016/6/1' AND '2016/7/1' AND Info_Data = 'Data_1'
GROUP BY Staff_No, Info_Data),
Column_Value2 = 'Data1'
WHERE Staff_No = 3201 AND Year_D = 2016 AND Month_D = 6 AND Column_Index = @cnt
END
ELSE
BEGIN
INSERT INTO Staff_Manager.dbo.Staff_Count_TBL
(Staff_No, Year_D, Month_D, Column_Index, Column_Value, Column_Value2)
SELECT 3201, 2016, 6, @cnt, COUNT(*), 'Data1'
FROM Staff_Manager.dbo.Staff_Time_TBL
WHERE Staff_No = 3201 AND Date_Data BETWEEN '2016/6/1' AND '2016/7/1' AND Info_Data = 'Data1'
GROUP BY Staff_No, Info_Data
END
SET @cnt = @cnt + 1
END
我想要实现的是遍历一个包含8个项目的列表，并将这些值输入到相应的列中。
例如，
在这一行，我已经硬编码Data1，
WHERE Staff_No = 3201 AND Date_Data
BETWEEN '2016/6/1' AND '2016/7/1' AND Info_Data = 'Data1'
我想做的就是这个，
WHERE Staff_No = 3201 AND Date_Data
BETWEEN '2016/6/1' AND '2016/7/1' AND Info_Data = @MyList[@cnt]
而且，
SELECT 3201, 2016, 6, @cnt, COUNT(*), @MyList[@cnt]
FROM Staff_Manager.dbo.Staff_Time_TBL
WHERE Staff_No = 3201 AND Date_Data
BETWEEN '2016/6/1' AND '2016/7/1' AND Info_Data = @MyList[@cnt]
但这不起作用。在研究了一点之后，我发现T-SQL实际上并没有列出一个列表，而是一个临时表可以说，你需要从中获取值。不幸的是，我似乎无法工作。
我有一个UPDATE和一个INSERT语句，我需要从列表中添加值。
编辑：最后一分钟代码调整，
DECLARE @cnt INT = 1;
DECLARE @MyList TABLE (Value NVARCHAR(50))
INSERT INTO @MyList VALUES ('Data1')
INSERT INTO @MyList VALUES ('Data2')
INSERT INTO @MyList VALUES ('Data3')
INSERT INTO @MyList VALUES ('Data4')
INSERT INTO @MyList VALUES ('Data5')
INSERT INTO @MyList VALUES ('Data6')
INSERT INTO @MyList VALUES ('Data7')
INSERT INTO @MyList VALUES ('Data8')
INSERT INTO @MyList VALUES ('Data9')
INSERT INTO @MyList VALUES ('Data10')
INSERT INTO @MyList VALUES ('Data11')
INSERT INTO @MyList VALUES ('Data12')
INSERT INTO @MyList VALUES ('Data13')
INSERT INTO @MyList VALUES ('Data14')
INSERT INTO @MyList VALUES ('Data15')
INSERT INTO @MyList VALUES ('Data16')
INSERT INTO @MyList VALUES ('Data17')
INSERT INTO @MyList VALUES ('Data18')
INSERT INTO @MyList VALUES ('Data19')
INSERT INTO @MyList VALUES ('Data20')
INSERT INTO @MyList VALUES ('Data21')
INSERT INTO @MyList VALUES ('Data22')
INSERT INTO @MyList VALUES ('Data23')
INSERT INTO @MyList VALUES ('Data24')
INSERT INTO @MyList VALUES ('Data25')
INSERT INTO @MyList VALUES ('Data26')
INSERT INTO @MyList VALUES ('Data27')
INSERT INTO @MyList VALUES ('Data28')
INSERT INTO @MyList VALUES ('Data29')
INSERT INTO @MyList VALUES ('Data30')
DECLARE @COUNTER INT = 0;
DECLARE @MAX INT = (SELECT COUNT(*) FROM @MyList)
DECLARE @VALUE VARCHAR(50);
WHILE @cnt <= @MAX
BEGIN
SET @VALUE = (SELECT Value FROM @MyList
ORDER BY 1 OFFSET @COUNTER
ROWS FETCH NEXT 1 ROWS ONLY);
PRINT @cnt
PRINT @VALUE
PRINT @COUNTER
IF EXISTS (SELECT * FROM Staff_Manager.dbo.Staff_Count_TBL WHERE Staff_No = 3005 AND Year_D = 2016 AND Month_D = 6 AND Column_Index = @cnt)
BEGIN
UPDATE Staff_Manager.dbo.Staff_Count_TBL
SET Column_Value = (
SELECT COUNT(*)
FROM Staff_Manager.dbo.Staff_Time_TBL
WHERE Staff_No = 3005 AND Date_Data BETWEEN '2016/6/1' AND '2016/7/1' AND Info_Data = @value
GROUP BY Staff_No, Info_Data),
Column_Value2 = @value
WHERE Staff_No = 3005 AND Year_D = 2016 AND Month_D = 6 AND Column_Index = @cnt
END
ELSE
BEGIN
INSERT INTO Staff_Manager.dbo.Staff_Count_TBL
(Staff_No, Year_D, Month_D, Column_Index, Column_Value, Column_Value2)
SELECT 3005, 2016, 6, @cnt, COUNT(*), @value
FROM Staff_Manager.dbo.Staff_Time_TBL
WHERE Staff_No = 3005 AND Date_Data BETWEEN '2016/6/1' AND '2016/7/1' AND Info_Data = @value
GROUP BY Staff_No, Info_Data
END
SET @cnt = @cnt + 1
SET @COUNTER = @COUNTER + 1
END
答案 0 :(得分：18)
您创建的不是列表而是表变量。那么如何迭代一张桌子。下面是一个简单的例子，如果您理解，我认为您可以继续：
（注意：在性能和大型表格方面，游标效率不高）
select * from iwdata.IW_MASTER_LOG
WHERE TRUNC(EXECUTION_START_DATE)=TRUNC(SYSDATE)
AND (EXECUTION_START_DATE-EXECUTION_ENDED_DATE) >to_date('40','mi');
<强>打印
DECLARE @MyList TABLE (Value NVARCHAR(50))
INSERT INTO @MyList VALUES ('Data1')
INSERT INTO @MyList VALUES ('Data2')
INSERT INTO @MyList VALUES ('Data3')
INSERT INTO @MyList VALUES ('Data4')
INSERT INTO @MyList VALUES ('Data5')
INSERT INTO @MyList VALUES ('Data6')
INSERT INTO @MyList VALUES ('Data7')
INSERT INTO @MyList VALUES ('Data8')
DECLARE @value VARCHAR(50)
DECLARE db_cursor CURSOR FOR
SELECT Value FROM @MyList
OPEN db_cursor
FETCH NEXT FROM db_cursor INTO @value
WHILE @@FETCH_STATUS = 0
BEGIN
PRINT @value
-- PUT YOUR LOGIC HERE
-- MAKE USE OR VARIABLE @value wich is Data1, Data2, etc...
FETCH NEXT FROM db_cursor INTO @value
END
CLOSE db_cursor
DEALLOCATE db_cursor
所以你有@value变量Data1
Data2
Data3
Data4
Data5
Data6
Data7
Data8
，Data等。我认为这解决了你的问题。
Data2循环+ WHILE + OFFSET：FETCH NEXT你得到相同的结果