Top "Union" questions

What is the difference between UNION and UNION ALL?

What is the difference between UNION and UNION ALL?

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What is the difference between JOIN and UNION?

What is the difference between JOIN and UNION? Can I have an example?

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How to order by with union in SQL?

Is it possible to order when the data is come from many select and union it together? Such as Select …

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Combine two tables for one output

Say I have two tables: KnownHours: ChargeNum CategoryID Month Hours 111111 1 2/1/09 10 111111 1 3/1/09 30 111111 1 4/1/09 50 222222 1 3/1/09 40 111111 2 4/1/09 50 UnknownHours: ChargeNum Month Hours 111111 2/1/09 70 111111 3/1/09 40.5 222222 7/1/09 25.5 I need to group these hours, …

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Intersection and union of ArrayLists in Java

Are there any methods to do so? I was looking but couldn't find any. Another question: I need these methods …

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Combine two tables that have no common fields

I want to learn how to combine two db tables which have no fields in common. I've checked UNION but …

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SQL Query - Using Order By in UNION

How can one programmatically sort a union query when pulling data from two tables? For example, SELECT table1.field1 FROM …

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Using union and order by clause in mysql

I want to use order by with union in mysql query. I am fetching different types of record based on …

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UNION with WHERE clause

I'm doing a UNION of two queries on an Oracle database. Both of them have a WHERE clause. Is there …

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How to use group by with union in t-sql

How can I using group by with union in t-sql? I want to group by the first column of a …

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