📅 最后修改于: 2020-11-29 08:58:39 🧑 作者: Mango
Teradata提供了几种操作字符串的功能。这些功能与ANSI标准兼容。
| Sr.No | String Function & Description |
|---|---|
| 1 |
|| Concatenates strings together |
| 2 |
SUBSTR Extracts a portion of a string (Teradata extension) |
| 3 |
SUBSTRING Extracts a portion of a string (ANSI standard) |
| 4 |
INDEX Locates the position of a character in a string (Teradata extension) |
| 5 |
POSITION Locates the position of a character in a string (ANSI standard) |
| 6 |
TRIM Trims blanks from a string |
| 7 |
UPPER Converts a string to uppercase |
| 8 |
LOWER Converts a string to lowercase |
下表列出了一些字符串函数及其结果。
| String Function | Result |
|---|---|
| SELECT SUBSTRING(‘warehouse’ FROM 1 FOR 4) | ware |
| SELECT SUBSTR(‘warehouse’,1,4) | ware |
| SELECT ‘data’ || ‘ ‘ || ‘warehouse’ | data warehouse |
| SELECT UPPER(‘data’) | DATA |
| SELECT LOWER(‘DATA’) | data |