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dev:sql:functions:coalesce [2010/07/02 08:08] tdo created |
dev:sql:functions:coalesce [2010/07/27 20:44] els |
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- | <html><div align="center"><span style="color:red">DRAFT</span></div></html> | ||
- | ====== Omnidex SQL Function: CASE ====== | ||
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+ | ====== Omnidex SQL Function: COALESCE ====== | ||
===== Description ===== | ===== Description ===== | ||
+ | The COALESCE function returns the first non-NULL expression among its arguments. | ||
+ | |||
+ | This function returns the same datatype as the passed parameter. If all passed parameters are NULL, then this function returns a NULL. | ||
+ | |||
===== Syntax ===== | ===== Syntax ===== | ||
+ | |||
+ | COALESCE ( expression [ , expression ... ] ) | ||
+ | |||
+ | |||
+ | == expression == | ||
+ | |||
+ | Required. An expression using SQL language that produces a value. A scalar expression is generally equivalent to a select item in the SQL SELECT statement, and can be a character expression, numeric expression or date expression. | ||
+ | |||
===== Example ===== | ===== Example ===== | ||
- | ==== Example 1 ==== | + | ==== Example 1: COALESCE against columns ==== |
+ | |||
+ | <code> | ||
+ | > select coalesce(name, individual) identifier from individuals; | ||
+ | |||
+ | IDENTIFIER | ||
+ | -------------------------------------------------- | ||
+ | MS. MARY LEWIS | ||
+ | MRS. ALICE R TOLLIVER | ||
+ | MR. SIDNEY K TOLLIVER | ||
+ | MRS. JENNIFER J HOPKINS | ||
+ | MR. CHARLIE HOPKINS | ||
+ | MS. KIMBERLY BLUE | ||
+ | KATHLEEN TUCKER | ||
+ | </code> | ||
+ | |||
+ | ====== Additional Resources ====== | ||
+ | |||
+ | See also: | ||
+ | {{page>dev:sql:functions:see_also_logic&noheader&nofooter&noeditbtn}} | ||
+ | |||
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+ | ===== | ||
+ |