如何将多个选择语句插入临时表

Question

我有三个不同数据的表，我需要插入一个 TEMP 表并在 StoredProcedure 中返回该表。

我试过了：

-- To get last 10 Days Letters count
SELECT col1,col2,1 AS Type, LettersCount
INTO #temp FROM tblData

-- To get last 4 weeks Letters count
SELECT col1,col2,2 AS Type, LettersCount
INTO #temp FROM tblData

-- To get month wise Letters count
SELECT col1,col2,3 AS Type, LettersCount
INTO #temp FROM tblData

将错误显示为

Msg 2714, Level 16, State 1, Line 16
There is already an object named '#temp ' in the database.
Msg 102, Level 15, State 1, Line 24
Incorrect syntax near 'T'.
Msg 2714, Level 16, State 1, Line 32
There is already an object named '#temp ' in the database.

Answer 1

发生错误是因为第一个 select into 语句创建了表，而第二个和第三个语句试图重新创建它。

将第二个和第三个查询改为：

insert into #temp
select..

Answer 2

SELECT INTO 语句还可用于使用另一个架构创建一个新的空表 select * into tablename from .. 这里 tablename 表不应该存在。

像这样改变你的插入：

SELECT col1,
       col2,
       1 AS Type,
       LettersCount
INTO   #temp
FROM   tblData

-- To get last 4 weeks Letters count
INSERT INTO #temp
SELECT col1,col2,2 AS Type,LettersCount
FROM   tblData

-- To get month wise Letters count
INSERT INTO #temp
SELECT col1,col2,3 AS Type,LettersCount
FROM   tblData 

Answer 3

创建一次临时表，然后将其他两个 SELECT 语句插入其中：

SELECT col1, col2, 1 AS Type, LettersCount
  INTO #temp
  FROM tblData;

INSERT INTO #temp
    SELECT col1, col2, 2 AS Type, LettersCount
      FROM tblData;

INSERT INTO #temp
    SELECT col1, col2, 3 AS Type, LettersCount
      FROM tblData;

Answer 4

你可以检查它是否已经存在

IF OBJECT_ID ('tempdb..#TempLetters') is not null
drop table #TempLetters


SELECT col1,col2,1 AS Type, LettersCount
INTO #TempLetters FROM tblData

-- To get last 4 weeks Letters count
INSERT INTO #TempLetters
SELECT col1,col2,2 AS Type, LettersCount
FROM tblData

-- To get month wise Letters count
INSERT INTO #TempLetters
SELECT col1,col2,3 AS Type, LettersCount
FROM tblData

Answer 5

为什么不只写一个插入语句并在插入之前合并表

with A as
(
    -- To get last 10 Days Letters count
    SELECT col1,col2,1 AS Type, LettersCount
    FROM tblData
    union all
    -- To get last 4 weeks Letters count
    SELECT col1,col2,2 AS Type, LettersCount
    FROM tblData
    union all
    -- To get month wise Letters count
    SELECT col1,col2,3 AS Type, LettersCount
    FROM tblData
)
select col1, col2, Type, LettersCount
INTO #temp 
FROM A

这将帮助您在需要时轻松地在 select 中添加更多表，因为您不再需要为它们添加任何插入语句