bill@bill=> CREATE COLLATION case_insensitive (provider = icu, locale = 'zh_Hans', deterministic = false); CREATE COLLATION bill@bill=> select * from test order by c1 collate "case_insensitive"; c1 --- a A b B c C (6 rows) 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. ...
CREATE COLLATION case_insensitive ( PROVIDER = icu, LOCALE = 'zh_Hans', DETERMINISTIC = false ); SELECT * FROM test ORDER BY c1 COLLATE "case_insensitive"; 使用citext模块: citext是一个扩展模块,允许你在PostgreSQL中创建大小写不敏感的文本类型列。 sql CREATE EXTENSION citext; CREATE TABLE test...
Sometimes you hear that PostgreSQL is case-insensitive, but it isn’t really. What it actually does is convert your SQL to lowercase by default. So take a look at this SQL: SELECT FullName FROM Person This gets converted to: SELECT fullname FROM person That is nice if you happen to lik...
krb_caseins_users | off | Sets whether Kerberos and GSSAPI user names should be treated as case-insensitive. krb_server_keyfile | FILE:/mnt/hgfs/pginstaller.pune/server/staging/linux-x64/etc/postgresql/krb5.keytab | Sets the location of the Kerberos server key file. lc_collate | zh_CN....
citext | 1.0 | public | data type for case-insensitive character strings plpgsql | 1.0 | pg_catalog | PL/pgSQL procedural language (2 rows) Now you can change the column type tocitext. -- alter username column typeALTERTABLEusersALTERCOLUMNusernameTYPEcitext;-- remove indexDROPINDEXunique_us...
SELECT * FROM students_info WHERE studentname = 'aLEx'; The output of the query will return the case-insensitive comparison of the “alex”. This can be advocated by the output itself. The output is: We can see that the query has searched for the term “Alex” regardless of the case ...
1、类SQL PLUS窗口:File->New->Command Window,这个类似于oracle的客户端工具sql plus,但比它好用多了。 2、设置关键字自动大写:Tools->Preferences->Editor,将Keyword case选择Uppercase。这样在窗口中输入sql语句时,关键字会自动大写,而其它都是小写。这样阅读代 ...
绝大多数时候,我们都是希望大小写不敏感的,大小写敏感反倒会带来很多困惑,查询不出,或者系统中存在同名的用户,一个叫John另一个叫john,MSSQL可以在创建库的时候指定大小写不敏感,而PG似乎没有这样的功能,它需要借助一个额外的组件,叫CITEXT,CI的意思就是Case Insensitive。要使用CITEXT组件,你需要安装postgresql10-...
In a similar way, the ILIKE operator works. The only difference is ILIKE operator does case-insensitive matching. Now if we search for the substring “AtE”, we will get the same result because the operator being used is the ILIKE operator which does not care about the case. The query ca...
SELECT * FROM users WHERE first_name ~* '^a'; Explanation: ~* '^a': The ~* operator performs a case-insensitive match for names starting with "a". ^a: The caret ^ denotes the start of the string. Example 3: Regex to Exclude Patterns ...