Returns the left-most characters of a string.
| Category: | String |
| Returned data type: | String |
specifies a string to search; this can be specified as string constant, field name, or expression.
| Note | If source is NULL, the function returns a NULL value. |
specifies an integer that indicates how many characters to return; this can be specified as numeric constant, field name, or expression.
| Note | When a count of zero or less is specified, an empty string is returned. |