Adobe COLDFUSION 9 Manual page 442

Developing applications

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DEVELOPING COLDFUSION 9 APPLICATIONS

Accessing and Using Data

To combine Table1 and Table2, use a UNION statement, as follows:

SELECT * FROM Table1

SELECT * FROM Table2

The UNION statement produces the following result (UNION) table:

Result table

Using aliases for column names

The column names of a UNION table are the column names in the result set of the first SELECT statement in the

UNION operation; Query of Queries ignores the column names in the other SELECT statement. To change the

column names of the result table, you can use an alias, as follows:

Select Type as SportType, Name as SportName from Table1

Select * from Table2

Duplicate rows and multiple tables

By default, the UNION operator removes duplicate rows from the result table. If you use the keyword ALL, then

duplicates are included.

You can combine an unlimited number of tables using the UNION operator, for example:

Select * from Table1

Select * from Table2

Select * from Table3

Parentheses and evaluation order

By default, the Query of Queries SQL engine evaluates a statement containing UNION operators from left to right.

You can use parentheses to change the order of evaluation. For example, the following two statements are different:

Name(varchar)

Last updated 8/5/2010