ColdFusion Developer's Guide

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Beta Beta Beta Beta Beta Beta Beta Beta Beta Beta ■ Both Numeric; for example, Tinyint, Smallint, Integer, Bigint, Double, Float, Real, Decimal, or Numeric ■ Both Characters; for example, Char, Varchar, or LongVarchar ■ Both Dates; for example, Time, TimeStamp, or Date NOTE Syntax select_expression = select_expression UNION [ALL] select_expression Example This example uses the following tables: Table1 Query Of Queries does not support ODBC-formatted dates and times. Type(int) Name(varchar) 1 Tennis 2 Baseball 3 Football Table2 ID(int) Sport(varchar) 3 Football 4 Volleyball 5 PingPong To combine Table1 and Table2, use a UNION statement, as follows: SELECT * FROM Table1 UNION SELECT * FROM Table2 The UNION statement produces the following result (UNION) table: Result table Type(int) Name(varchar) 1 Tennis 2 Baseball 3 Football 610 Using Query of Queries
Beta Beta Beta Beta Beta Beta Beta Beta Beta Beta Result table 4 Volleyball 5 PingPong 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; <strong>ColdFusion</strong> 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 UNION 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 UNION Select * from Table2 UNION 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: /* First statement. */ SELECT * FROM TableA UNION ALL (SELECT * FROM TableB UNION SELECT * FROM TableC ) /* Second statement. */ (SELECT * FROM TableA UNION ALL SELECT * FROM TableB Query of Queries user guide 611
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Beta ColdFusion Developer’s Guide
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Beta Contents Introduction . . . .
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Beta Chapter 8: Creating ColdFusion
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Beta About resource and sandbox sec
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Beta Refining your searches with zo
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Beta Authentication. . . . . . . .
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Beta Using WDDX. . . . . . . . . .
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Beta Sending outgoing messages . .
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Index A access client variables 412
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authentication application-based ex
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cfexit tag about 43 behavior of 296
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SetVariable 103 StructClear 134 Str
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caching 1144 curve chart considerat
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forms for updating 584 insert form
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adding custom header 1428 attachmen
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in user-defined functions 222 infor
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esponding to messages from ColdFusi
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Internet applications 19 ColdFusion
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functions for 502 generating multi-
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described 1539 example 1544 onIncom
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unions 609 user guide 609 using 599
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text 1470 retrieving, e-mail messag
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about 37, 74, 324, 400, 404, 417 bu
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web services, consuming 1319 web se
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V validating data types 83 form fie
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type conversions 1304 web services,
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