LEFT:返回字符串中从左边开始指定个数字符
LEFT(character_expression,integer_expression);
举例
RIGTH:返回字符串从右边开始指定个数字符
RIGHT(character_expression,integer_expression);
LEFT:返回字符串中从左边开始指定个数字符
LEFT(character_expression,integer_expression);
举例
RIGTH:返回字符串从右边开始指定个数字符
RIGHT(character_expression,integer_expression);