Using a case-insensitive ICU collation Prerequisites If you want to follow along this post’s examples, complete the following prerequisite steps: Create anAmazon Aurora PostgreSQL-Compatible Editioncluster or anAmazon Relational Database Service (Amazon RDS) for PostgreSQLinstance if you don’t already...
https://dba.stackexchange.com/questions/106964/why-is-my-postgresql-order-by-case-insensitive https://www.appsloveworld.com/postgresql/100/80/oracle-vs-postgres-order-by https://help.aliyun.com/document_detail/52950.html https://www.postgresql.org/docs/current/sql-createcollation.html https://...
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. ...
regular expression matching is not case insensitive, and you have to use the case insensitive operator ~* explicitly Using case-insensitive ICU collations If you are using PostgreSQL v12 or better, and PostgreSQL was configured --with-icu, you can define a case-insensitive collation like this: ...
9.5的常用的一些设置,自己mark一下防止丢失;参数用途的说明,不做说明,仅为自己记录 max_connections = 3000 work_mem = 8MB shared_buffers = 1GB fsync = off synchronous_commit = off commit_delay = 500 commit_siblings = 25 checkpoint_completion_target = 0.9 autovacuum...
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...
PG 12现在支持对ICU提供的排序规则进行不区分大小写(case-insensitive)、不区分口音(accent-insensitive)的比较,亦被称为非确定性校对(nondeterministic collations)。 当该特性被使用时,这些collation可以为排序和比较提供便利,但同时可能会因为对字符串额外的检查,而导致额外的性能损失。
lc_collate | zh_CN.UTF-8 | Shows the collation order locale. lc_ctype | zh_CN.UTF-8 | Shows the character classification and case conversion locale. lc_messages | zh_CN.UTF-8 | Sets the language in which messages are displayed. lc_monetary | zh_CN.UTF-8 | Sets the locale for fo...
extern void pg_set_regex_collation(Oid collation); 处理正则表达式常用的函数有 pg_regcomp()、pg_regexec()、pg_regfree() 和 pg_regerror()。 一般处理步骤:编译正则表达式 pg_regcomp(),匹配正则表达式 pg_regexec(),释放正则表达式 pg_regfree()。
https://oracle-base.com/articles/12c/column-level-collation-and-case-insensitive-database-12cr2 https://docs.oracle.com/en/database/oracle/oracle-database/12.2/refrn/ALL_TAB_COLS.html#GUID-85036F42-140A-406B-BE11-0AC49A00DBA3 https://blog.csdn.net/weixin_29944865/article/details/11477319...