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. ...
Sort order in queries using ORDER BY or the standard comparison operators on textual data The upper, lower, and initcap functions Pattern matching operators (LIKE, SIMILAR TO, and POSIX-style regular expressions); locales affect both case insensitive matching and the classification of characters by ...
Option 1: Using case-insensitive comparison functions In this option, we discuss the PostgreSQL in-built comparison functionsLOWERandUPPER. These functions allow you to convert a string to lowercase or uppercase at runtime, respectively. Thelowerfunction takes a string as an argument and returns a...
As for case sensitivity for table and column names and the like, unquoted names are case insensitive by default, as you mention. You should be able to quote them in your script manually if you really need a specific case. E.g., you're trying to match your identifier names in your code...
Writing the case-insensitive queries is a crucial task to do in order to perform effective searching/matching in PostgreSQL. There are four methods to write the case-insensitive matching. The first one is by using the ILIKE operator, and the second in using the CITEXT extension. Using the LOW...
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. ...
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. ...
MySQL中排序规则utf8_general_ci不区分大小写,ci为case insensitive的缩写,即大小写不敏感.比如,主键内容为A,插入a将是不允许的,而查找a是可以查到A的.也就是说,A和a在字符判断中被当做一样来处理.排序规则根据特定语言和区域设置的标准指定对字符串数据进行排序和比较的规则. 排序规则的概念,以PHP的intl扩展举...
浅谈PostgreSQL中⼤⼩写不敏感问题 本⽂主要讨论PostgreSQL中⼤⼩写不敏感存在的问题。默认情况下，PostgreSQL会将列名和表名全部转换为⼩写状态。图1 Person与person 如图1所⽰，我们创建表person，其中包含name列。然后插⼊⼀条记录。执⾏SELECT查询时，使⽤列名Name和表名Person ⽽不是name和...
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...