If I have two tables like this:
Table1
Month 1 3
Table 2
Month 1 4
How do I get the following result set? Result Set
Month 1 3 4
Use the UNION
operator like this:
SELECT Month FROM Table1
UNION
SELECT Month FROM Table2
The SQL UNION operator combines two or more SELECT statements and produces a single result with unique values .
SELECT [Month]
FROM Table1
UNION
SELECT [Month]
FROM Table2
You will want to use a UNION to combine the results into a single set.
SELECT Month
FROM Table1
UNION
SELECT Month
FROM Table2
By default UNION
only grabs distinct values, therefore your exact result. If you wanted duplicate values you could use UNION ALL
which would show month 1 in your example twice.
Here is a good tutorial that shows the differences as well.
使用UNION
:
SELECT month FROM table1 UNION SELECT month FROM table2
从表1中选择月份从表2中选择月份
Here is my solution
declare @ temptable table( months varchar(10) ) inserto into @temptable(months) select distinct Month from Table1 inserto into @temptable(months) select distinct Month from Table2 select disticnt * from @temptable
Maybe there is a better way?
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