In SQL Server CREATE INDEX command creates a relational index on a table or view. Also called a rowstore index because it is either a clustered or nonclustered btree index. You can create a rowstore index before there is data in the table. Use a rowstore index to improve query performance,...
insert into rw_split select generate_series(1,50000), md5(random()::text)::text; create index rw_split_col_hash on rw_split using hash(col); explain select * from rw_split where col =2; ---btree 索引 drop index rw_split_col_hash; create index rw_split_col_btree on rw_split usi...
key_part: {col_name[(length)]|(expr)}[ASC | DESC]index_type: USING {BTREE|HASH} index_option: KEY_BLOCK_SIZE[=]value|index_type|WITHPARSER parser_name|COMMENT'string'|{VISIBLE|INVISIBLE} reference_definition:REFERENCEStbl_name (key_part,...)[MATCH FULL | MATCH PARTIAL | MATCH SIMPLE]...
index_col_name: col_name [(length)] [ASC | DESC] index_type: USING {BTREE | HASH | RTREE} index_option: [ KEY_BLOCK_SIZE [=] value | index_type | WITH PARSER parser_name | COMMENT 'string' | CLUSTERING={YES| NO} ] [ IGNORED | NOT IGNORED ] algorithm_option: ALGORITHM [=] ...
CREATE DATABASE CREATE EVENT CREATE FUNCTION CREATE FUNCTION UDF CREATE INDEX CREATE PROCEDURE CREATE RESOURCE GROUP CREATE ROLE CREATE SERVER CREATE SPATIAL REFERENCE SYSTEM CREATE TABLE CREATE TABLESPACE CREATE TRIGGER CREATE USER CREATE VIEW SHOW SHOW CREATE DATABASE SHOW CREATE EVENT SHOW CREATE FUNCTI...
● index_type 有些存储引擎允许在创建索引时指定索引类型。索引类型说明符的语法是 USING type_name。 示例: 1. CREATE TABLE lookup 2. (id INT, INDEX USING BTREE (id)) 3. ENGINE = MEMORY; 1. 2. 3. USING 的首选使用位置是在索引列列表之后。它可以在列的列表之前给出,但是不推荐这种使用方式,...
reference_definition index_col_name: col_name [(length)] [ASC | DESC] index_type: USING {BTREE | HASH | RTREE} index_option: [ KEY_BLOCK_SIZE [=] value {{{|}}} index_type {{{|}}} WITH PARSER parser_name {{{|}}} VISIBLE {{{|}}} COMMENT 'string' {{{|}}} CLUSTERING={...
MethodThe default value isBTREE, which is applicable to a global index. Valid values:Empty, BTREE, and HASH. - A BTREE index stores data in a B+ tree structure, and is suitable for searching for SQL statements in the specified index scope. ...
testdb=>create unique index"rule_test_1"on"public"."test_1"usingbtree("xh","id");CREATEINDEX 4. 查看创建的索引,xh的唯一索引创建成功 代码语言:javascript 代码运行次数:0 复制 Cloud Studio代码运行 testdb=>\d+public.test_1 Table"public.test_1"Column|Type|Modifiers|Storage|Stats target|Descri...
}index_type: USING {BTREE | HASH}algorithm_option: ALGORITHM [=] {DEFAULT | INPLACE | COPY}lock_option: LOCK [=] {DEFAULT | NONE | SHARED | EXCLUSIVE} Normally, you create all indexes on a table at the time the table itself is created withCREATE TABLE. SeeSection 13.1.18, “CREATE...