This shows you the differences between two versions of the page.
|
dev:sql:functions:substring [2011/01/23 23:58] els |
dev:sql:functions:substring [2016/06/28 22:38] |
||
|---|---|---|---|
| Line 1: | Line 1: | ||
| - | {{page>:top_add&nofooter&noeditbtn}} | ||
| - | ====== Development: Omnidex SQL ====== | ||
| - | ===== SQL Functions: SUBSTRING ===== | ||
| - | ==== Description ==== | ||
| - | The SUBSTRING function returns a new character string that is a portion of another character expression. The new string begins at the specified starting point in the original expression and extends the number of characters specified in the length parameter. If the length parameter is omitted, the new string extends to the end of the original string. | ||
| - | |||
| - | This function returns a C STRING datatype. | ||
| - | |||
| - | ==== Syntax ==== | ||
| - | SUBSTRING( character_expression FROM numeric_expression [ FOR numeric_expression ] ) | ||
| - | |||
| - | == character_expression == | ||
| - | Required. Any expression that returns a character-class datatype to be used as the substring target. Examples of expressions are columns, concatenations of columns, literal strings and functions that return a character datatype. | ||
| - | |||
| - | == numeric_expression == | ||
| - | |||
| - | Any expression that returns a numeric_class datatype to be used as either the offset or the length. | ||
| - | |||
| - | The FROM //numeric_expression// indicates the number of characters from the start of the //character_expression// to start the extraction of the partial string. | ||
| - | |||
| - | ^ String| M | y | | s | t | r | i | n | g | | ||
| - | ^ Position| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | | ||
| - | |||
| - | If the start_no was 4 in the string above, then 's' would be the first character of the returned substring. | ||
| - | |||
| - | ==== Example ==== | ||
| - | === Example 1: Substring of column === | ||
| - | <code> | ||
| - | > select name, | ||
| - | >> substring(phone from 2 for 3) area_code, | ||
| - | >> substring(phone from 7 for 8) phone_number | ||
| - | >> from individuals; | ||
| - | |||
| - | NAME ARE PHONE_NU | ||
| - | -------------------------------------------------- --- -------- | ||
| - | MS. MARY LEWIS 203 318-1659 | ||
| - | MRS. ALICE R TOLLIVER | ||
| - | MR. SIDNEY K TOLLIVER | ||
| - | MRS. JENNIFER J HOPKINS 860 998-2013 | ||
| - | MR. CHARLIE HOPKINS | ||
| - | MS. KIMBERLY BLUE | ||
| - | KATHLEEN TUCKER | ||
| - | |||
| - | </code> | ||
| - | === Example 2: Complex expression === | ||
| - | <code> | ||
| - | The following example removes the salutation from the name. | ||
| - | |||
| - | <code> | ||
| - | > select trim( | ||
| - | >> substring(NAME | ||
| - | >> from position('.' in NAME) + 1 | ||
| - | >> for $column_length(NAME) - position('.' in NAME))) nme | ||
| - | >> from INDIVIDUALS; | ||
| - | |||
| - | NME | ||
| - | -------------------------------------------------- | ||
| - | MARY LEWIS | ||
| - | ALICE R TOLLIVER | ||
| - | SIDNEY K TOLLIVER | ||
| - | JENNIFER J HOPKINS | ||
| - | CHARLIE HOPKINS | ||
| - | KIMBERLY BLUE | ||
| - | KATHLEEN TUCKER | ||
| - | </code> | ||
| - | ====== Additional Resources ====== | ||
| - | |||
| - | See also: | ||
| - | {{page>dev:sql:functions:see_also_string&nofooter&noeditbtn&noheader}} | ||
| - | |||
| - | |||
| - | {{page>:bottom_add&nofooter&noeditbtn}} | ||
| - | |||
| - | |||