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dev:sql:functions:lpad [2009/12/07 14:26] tdo |
dev:sql:functions:lpad [2010/07/09 03:35] els |
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| - | <html><div align="center"><span style="color:red">DRAFT</span></div></html> | ||
| - | ====== Omnidex SQL Function: $LPAD ====== | ||
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| + | ====== Omnidex SQL Function: $LPAD ====== | ||
| ===== Description ===== | ===== Description ===== | ||
| - | The $LPAD function adds pad characters to the left of a character string up to the specified total length. | + | Pad the string on the left with spaces or the named character. If the string is already padded, as happens with a CHARACTER datatype, the string must first be trimmed using the TRIM function. |
| - | The return data type is C STRING of length specified in the return_length parameter + 1. | + | This function returns a C STRING datatype. |
| ===== Syntax ===== | ===== Syntax ===== | ||
| - | $LPAD( <column_spec | 'string'> , return_length [ ,pad_character ] ) | ||
| - | == < column_spec, string > == | + | $LPAD( character_expression, num_characters [, pad_character] ) |
| - | Required. The string to be "padded". If the length of the string is longer than n, the portion of the string that fits into n is returned. | + | |
| - | == return_length == | + | == character_expression == |
| - | Required. n is the total length of the return value ( 0 < n <= 255) | + | |
| - | == pad_character == | + | Required. Any expression that returns a character-class datatype. Examples of expressions are columns, concatenations of columns, literal strings and functions that return a character datatype. |
| - | Optional. pad evaluates to a single character. The default is the space character. | + | |
| - | ===== Example ===== | + | |
| - | ==== Example 1 ==== | + | |
| - | <code SQL> | + | |
| - | SELECT | + | |
| - | $LPAD(COMPANY, 45, '*'), | + | |
| - | $RPAD(COMPANY, 45, '#') | + | |
| - | FROM CUSTOMERS | + | |
| - | WHERE COMPANY='SYSTEMS' | + | |
| - | *****Dynamic Information Systems Corporation | + | == num_characters == |
| - | Dynamic Information Systems Corporation ##### | + | |
| + | Required. The number of characters to be returned from the function, with the left-most characters padded with spaces or the named character. | ||
| + | |||
| + | == pad_character == | ||
| + | |||
| + | Optional. The character to be used to pad the string. If this parameter is omitted, then a space is used as the pad character. | ||
| + | |||
| + | ===== Examples ===== | ||
| + | ==== Example: Column ==== | ||
| + | |||
| + | In this example, the name must first be trimmed and since it is already padded with spaces. | ||
| + | |||
| + | <code> | ||
| + | > SELECT $lpad(trim(name), 40, '.') nme FROM individuals; | ||
| + | |||
| + | NME | ||
| + | ---------------------------------------- | ||
| + | ..........................MS. MARY LEWIS | ||
| + | ...................MRS. ALICE R TOLLIVER | ||
| + | ...................MR. SIDNEY K TOLLIVER | ||
| + | .................MRS. JENNIFER J HOPKINS | ||
| + | .....................MR. CHARLIE HOPKINS | ||
| + | .......................MS. KIMBERLY BLUE | ||
| + | .........................KATHLEEN TUCKER | ||
| </code> | </code> | ||
| + | |||
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