sql - Union 2 表具有相同的结构 SQL Server

Question

我有 2 个具有相同结构的表，例如:Table1(Timestamp, Value)和Table2(Timestamp, Value) 。我想要将这些表联合 2 作为一个表，例如: Table3(Timestamp, Value1, Value2)哪里Value1 is value of Table1和Value2 is value of Table2 。我怎样才能在 SQL Server 上做到这一点？

Answer 1

试试这个

DECLARE @table1 TABLE (TS int, Value int);
DECLARE @table2 TABLE (TS int, Value int);

DECLARE @table3 TABLE(TS int, Value1 int, Value2 int);


INSERT INTO @table1(TS, Value)
SELECT 1, 12
UNION SELECT 3, 34
UNION SELECT 9, 122

INSERT INTO @table2(TS, Value)
SELECT 1, 23
UNION SELECT 2, 99
UNION SELECT 3, 999
UNION SELECT 5, 1222

-- 答案:--

INSERT INTO @table3(TS, Value1, Value2)
SELECT ISNULL(t1.TS, t2.TS), t1.Value, T2.Value
FROM @table1 t1
FULL JOIN @table2 t2 ON t2.TS = t1.TS

SELECT * FROM @table3
ORDER BY TS

上面的示例代码。将 TS 更改为首选名称和数据类型