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| - | {{page>:sql_bar&nofooter&noeditbtn}} | + | ====== Development: Omnidex SQL ====== |
| - | ====== Omnidex SQL Function: SUBSTRING ====== | + | ===== SQL Functions: SUBSTRING ===== |
| - | ===== Description ===== | + | ==== 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. | 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. | ||
| - | The return data type is C STRING. | + | This function returns a STRING datatype. |
| - | ===== Syntax ===== | + | |
| + | ==== Syntax ==== | ||
| SUBSTRING( character_expression FROM numeric_expression [ FOR numeric_expression ] ) | SUBSTRING( character_expression FROM numeric_expression [ FOR numeric_expression ] ) | ||
| Line 23: | Line 24: | ||
| If the start_no was 4 in the string above, then 's' would be the first character of the returned substring. | If the start_no was 4 in the string above, then 's' would be the first character of the returned substring. | ||
| - | ===== Example ===== | + | ==== Example ==== |
| - | ==== Example 1: Substring of column ==== | + | === Example 1: Substring of column === |
| - | <code SQL> | + | <code> |
| > select name, | > select name, | ||
| >> substring(phone from 2 for 3) area_code, | >> substring(phone from 2 for 3) area_code, | ||
| Line 42: | Line 43: | ||
| </code> | </code> | ||
| - | ==== Example 2: Complex expression ==== | + | === Example 2: Complex expression === |
| - | <code SQL> | + | <code> |
| The following example removes the salutation from the name. | The following example removes the salutation from the name. | ||
| - | <code SQL> | + | <code> |
| > select trim( | > select trim( | ||
| >> substring(NAME | >> substring(NAME | ||
| Line 63: | Line 64: | ||
| KATHLEEN TUCKER | KATHLEEN TUCKER | ||
| </code> | </code> | ||
| - | {{page>:bottom_add&nofooter&noeditbtn}} | + | ====== Additional Resources ====== |
| + | See also: | ||
| + | {{page>dev:sql:functions:see_also_string&nofooter&noeditbtn&noheader}} | ||
| - | {{page>:top_add&nofooter&noeditbtn}} | ||
| - | {{page>:sql_bar&nofooter&noeditbtn}} | ||
| - | ====== Omnidex SQL Function: POSITION ====== | ||
| - | ===== Description ===== | ||
| - | The POSITION function finds the position of a search_string in a target_string. | ||
| - | If the target_string is of length zero, the result is 1. | + | {{page>:bottom_add&nofooter&noeditbtn}} |
| - | If the search_string occurs as a substring within the target_string, the character position where the search_string first occurs is returned. If neither of these conditions is true, the result is 0. | ||
| - | The return data type is a 4-byte INTEGER. | ||
| - | String comparisons are case-sensitive. Use the UPPER and LOWER functions around the search_string and the target_string to produce a case-insensitive search. | ||
| - | |||
| - | ===== Syntax ===== | ||
| - | |||
| - | POSITION( search_expression IN target_expression) | ||
| - | |||
| - | == search_expression === | ||
| - | |||
| - | Any expression that returns a character-class datatype to be used as the search criteria. Examples of expressions are columns, concatenations of columns, literal strings and functions that return a character datatype. | ||
| - | |||
| - | == target_expression == | ||
| - | |||
| - | Any expression that returns a character-class datatype to be used as the search target. Examples of expressions are columns, concatenations of columns, literal strings and functions that return a character datatype. | ||
| - | |||
| - | ===== Example ===== | ||
| - | ==== Example 1: Column ==== | ||
| - | |||
| - | <code SQL> | ||
| - | > select name, position('.' in name) pos from individuals; | ||
| - | |||
| - | NAME POS | ||
| - | -------------------------------------------------- ----------- | ||
| - | MS. MARY LEWIS 3 | ||
| - | MRS. ALICE R TOLLIVER 4 | ||
| - | MR. SIDNEY K TOLLIVER 3 | ||
| - | MRS. JENNIFER J HOPKINS 4 | ||
| - | MR. CHARLIE HOPKINS 3 | ||
| - | MS. KIMBERLY BLUE 3 | ||
| - | KATHLEEN TUCKER 0 | ||
| - | |||
| - | </code> | ||
| - | |||
| - | ==== Example 2: Complex expression ==== | ||
| - | |||
| - | The following example removes the salutation from the name. | ||
| - | |||
| - | <code SQL> | ||
| - | > 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> | ||
| - | |||
| - | {{page>:bottom_add&nofooter&noeditbtn}} | ||