PHP-如何选择只有12个字符的列_Php_Sql_Database

PHP-如何选择只有12个字符的列

php sql database

PHP-如何选择只有12个字符的列,php,sql,database,Php,Sql,Database,示例：我希望sql只输出具有6位字符“aaaaa”的行，我不希望有超过6位字符的行。从lenmycol=6的mytable中选择* "SELECT * FROM table WHERE LENGTH(columnName) = 6" If MySql and "SELECT * FROM table WHERE LEN(columnName) = 6" If MSSql SELECT * FROM table WHERE field REGEXP '^[A]{6}$';

示例：我希望sql只输出具有6位字符“aaaaa”的行，我不希望有超过6位字符的行。

从lenmycol=6的mytable中选择*

"SELECT * FROM table WHERE LENGTH(columnName) = 6" If MySql and
"SELECT * FROM table WHERE LEN(columnName) = 6" If MSSql

SELECT * FROM table WHERE field REGEXP '^[A]{6}$';