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- | ====== Omnidex SQL Function: COALESCE ====== | ||
- | ===== Description ===== | ||
- | The COALESCE function returns the first non-NULL expression among its arguments. | ||
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- | This function returns the same datatype as the passed parameter. If all passed parameters are NULL, then this function returns a NULL. | ||
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- | ===== Syntax ===== | ||
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- | COALESCE ( expression [ , expression ... ] ) | ||
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- | == expression == | ||
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- | 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. | ||
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- | ===== Example ===== | ||
- | ==== Example 1: COALESCE against columns ==== | ||
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- | <code> | ||
- | > select coalesce(name, individual) identifier from individuals; | ||
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- | 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> | ||
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- | ====== Additional Resources ====== | ||
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- | See also: | ||
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- | ===== | ||