SQL字符串函数简单说明.字符串函数对二进制数据、字符串和表达式执行不同的运算。此类函数作用于CHAR、VARCHAR、 BINARY、 和VARBINARY 数据类型以及可以隐式转换为CHAR 或VARCHAR的数据类型。可以在SELECT 语句的SELECT 和WHERE 子句以及表达式中使用字符串函数。-SQL string functions briefly described. String functions perform different operations on binary data, strings, and expressions. Such functions operate on CHAR, VARCHAR, BINARY, and VARBINARY data types, and can be implicitly converted to CHAR or VARCHAR data type. You can use the string functions in SELECT statements SELECT and WHERE clauses, and expressions.