Question

如何选择mysql中只包含大写字符的字段或不包含任何小写字符的字段？

Answer 1

您可能希望使用区分大小写的collation。我相信默认值不区分大小写。例如：

CREATE TABLE my_table (
   id int,
   name varchar(50)
) CHARACTER SET latin1 COLLATE latin1_general_cs;

INSERT INTO my_table VALUES (1, 'SomeThing');
INSERT INTO my_table VALUES (2, 'something');
INSERT INTO my_table VALUES (3, 'SOMETHING');
INSERT INTO my_table VALUES (4, 'SOME4THING');

然后：

SELECT * FROM my_table WHERE name REGEXP '^[A-Z]+$';
+------+-----------+
| id   | name      |
+------+-----------+
|    3 | SOMETHING |
+------+-----------+
1 row in set (0.00 sec)

如果您不想对整个表使用区分大小写的排序规则，您还可以将COLLATE子句用作@kchau suggested in the other answer。

让我们尝试使用不区分大小写的排序规则表：

CREATE TABLE my_table (
   id int,
   name varchar(50)
) CHARACTER SET latin1 COLLATE latin1_general_ci;

INSERT INTO my_table VALUES (1, 'SomeThing');
INSERT INTO my_table VALUES (2, 'something');
INSERT INTO my_table VALUES (3, 'SOMETHING');
INSERT INTO my_table VALUES (4, 'SOME4THING');

这不会很好用：

SELECT * FROM my_table WHERE name REGEXP '^[A-Z]+$';
+------+-----------+
| id   | name      |
+------+-----------+
|    1 | SomeThing |
|    2 | something |
|    3 | SOMETHING |
+------+-----------+
3 rows in set (0.00 sec)

但我们可以使用COLLATE子句将名称字段整理为区分大小写的排序规则：

SELECT * FROM my_table WHERE (name COLLATE latin1_general_cs) REGEXP '^[A-Z]+$';
+------+-----------+
| id   | name      |
+------+-----------+
|    3 | SOMETHING |
+------+-----------+
1 row in set (0.00 sec)

Answer 2

这对我有用。它找到了所有带有大写字符的用户电子邮件：

SELECT * FROM users WHERE mail REGEXP BINARY '[A-Z]';

Answer 3

SELECT * FROM table1 WHERE (columnname COLLATE latin1_bin )=UPPER(depart);

Answer 4

试试这个 -

SELECT * FROM <mytable> WHERE UPPER(<columnname>) = <columnname>

Answer 5

使用REGEXP：http://www.tech-recipes.com/rx/484/use-regular-expressions-in-mysql-select-statements/

将[:upper:]用于大写字母。

SELECT * FROM table WHERE field REGEXP '^[[:upper:]+]$'

Answer 6

基本eg。

SELECT * FROM foo WHERE bar REGEXP '[A-Z]';

Answer 7

SELECT column_name FROM table WHERE column_name REGEXP BINARY '^[A-Z]+$'

Answer 8

在评论中找到了它-它值得发表一个帖子：

SELECT * FROM mytable WHERE BINARY mycolumn = BINARY UPPER(mycolumn);

WHERE UPPER(mycolumn) = mycolumn的问题是排序规则，这取决于您的表可以在其中使用什么。

选择仅包含大写字母的所有字段

8 个答案: