CREATE TABLE table_name ( column_name VARCHAR COLLATE "collation_name" ); 复制代码 在创建索引时指定排序规则,例如: CREATE INDEX index_name ON table_name (column_name COLLATE "collation_name"); 复制代码 在比较字符串时使用COLLATE来指定排序规则,例如: SELECT * FROM table_name WHERE column_name...
表的列可以有自己的collate,ctype 吗? create table collates (id serial primary key, name1 varchar(20) collate "en_US.utf8",name2 varchar(20)); insert into collates (name1,name2) values ('C','c'); insert into collates (name1,name2) values ('c','C'); insert into collates (na...
排序语句中的collate与索引的collate保持一致,才能使用这个索引进行排序。命令如下: createindex idxaon<table_name>(<column_name>collate"en_US"); explainselect*from<table_name>orderby<column_name>collate"en_US"; 输出结果示例如下: QUERY PLAN---IndexOnlyScanusingidxaon<table_name>(cost=0.15..31.55row...
CREATE [ [ GLOBAL | LOCAL ] { TEMPORARY | TEMP } | UNLOGGED ] TABLE [ IF NOT EXISTS ] table_name ( [ { column_name data_type [ STORAGE { PLAIN | EXTERNAL | EXTENDED | MAIN | DEFAULT } ] [ COMPRESSION compression_method ] [ COLLATE collation ] [ column_constraint [ ... ] ] ...
PostgreSQL查询引擎——create table xxx(...)基础建表流程 CREATE TABLE table_name ( [ { column_name data_type [ COLLATE collation ] [ column_constraint [ ... ] ] } [, ... ] ] ) where column_constraint is: [ CONSTRAINT constraint_name ] { NOT NULL | NULL | CHECK ( expression ) ...
oracle 12.2开始支持collate的概念,使用也类似: CREATETABLEt1 ( idNUMBER, companyVARCHAR2(15CHAR) COLLATE BINARY_CI,CONSTRAINTt1_pkPRIMARYKEY(id) );INSERTINTOt1VALUES(1,'Löwenbrauerei' );INSERTINTOt1VALUES(2,'LÖwenbrauerei' );INSERTINTOt1VALUES(3,'Lowenbrauerei' ...
altertable<table_name>alter<column_name>type textCOLLATE"en_US"; 使用本土化索引以及本土化 SQL。該方法不修改原有資料。命令如下: createindex idxaon<table_name>(<column_name>collate"en_US"); explainselect*from<table_name>orderby<column_name>collate"en_US"; ...
简介:初始化集群,建库,建表,建索引,sort | compare QUERY时都可以指定COLLATE。用法参考https://www.postgresql.org/docs/9.5/static/sql-createtable.htmlhttps://www.postgresql.org/docs/. 初始化集群,建库,建表,建索引,sort | compare QUERY时都可以指定COLLATE。
postgres=# \l+ List of databases Name | Owner | Encoding | Collate | Ctype | ICU Locale | Locale Provider | Access privileges---+---+---+---+---+---+---+---advent_of_code
LC_COLLATE = 'en_US.UTF-8' LC_CTYPE = 'en_US.UTF-8' TABLESPACE = pg_default CONNECTION LIMIT = -1; COMMENT ON DATABASE class IS 'pg_class create table'; CREATE TEMPORARY TABLE tempory_table( id int, system_info text );