在SQL Server中使用#temptable存在条件的所有联合？

Question

我得到了

INSERT INTO TABLE3
SELECT * FROM table1
UNION ALL
if object_id('tempdb..#temp') is not null drop table tempdb..#temp
select * into #temp from (SELECT * FROM table2) then original SELECT for UNION

但我收到语法错误？

任何帮助将不胜感激。谢谢

Answer 1

我不确定你想要达到的目标，但我认为它会帮助你在插入之前删除表格。

if object_id('tempdb..#temp') is not null 
    drop table tempdb..#temp

SELECT * INTO #temp
FROM table2

INSERT INTO TABLE3
SELECT *
FROM table1
UNION ALL
SELECT *
FROM #temp