PRIMARY KEY (`id`) USING BTREE,指定id列为主键，使用B树作为索引。
MYSQL primary key use btree 是什么含义了解一下 CREATE TABLE `sth_definition` ( `id` int(11) NOT NULL AUTO_INCREMENT, `analyseId` bigint(20) DEFAULT NULL, `levelCondition` varchar(2048) DEFAULT NULL, `filed1` double DEFAULT NULL, `dfdf` double DEFAULT NULL, `dfsdf` double DEFAULT NULL...
MYSQL primary key use btree 是什么含义了解一下 CREATE TABLE `sth_definition` ( `id` int(11) NOT NULL AUTO_INCREMENT, `analyseId` bigint(20) DEFAULT NULL, `levelCondition` varchar(2048) DEFAULT NULL, `filed1` double DEFAULT NULL, `dfdf` double DEFAULT NULL, `dfsdf` double DEFAULT NULL...
KEY `uniq_jd_pin` (`jd_pin`) USING BTREE, KEY `uniq_phone_jd_pin` (`phone`,`jd_pin`) USING BTREE, KEY `idx_sync_state` (`sync_state`) USING BTREE “Key”是什么, 意思咧? PRIMARY KEY:主键,即:唯一索引 key的话,就是普通索引。
PRIMARY KEY (`id`) USING BTREE unique key(唯一性约束) 1.一张表可以有多个唯一性约束,通常限制非主键列 2.没有重复值但允许为空(NULL) 3.不可作为外键 4.只要唯一就可以更新 使用语法: CREATE [ UNIQUE | FULLTEXT ] INDEX index_name ON table_name (index_col_name, ...); ...
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The syntax to create a primary key using theCREATE TABLE statementin MySQL is: CREATE TABLE table_name ( column1 column_definition, column2 column_definition, ... CONSTRAINT [constraint_name] PRIMARY KEY [ USING BTREE | HASH ] (column1, column2, ... column_n) ); ...
The syntax to create a primary key using theCREATE TABLE statementin MariaDB is: CREATE TABLE table_name ( column1 column_definition, column2 column_definition, ... CONSTRAINT [constraint_name] PRIMARY KEY [ USING BTREE | HASH ] (column1, column2, ... column_n) ); ...
Bug #24985UTF8 ENUM primary key on MEMORY using BTREE causes incorrect duplicate entries Submitted:12 Dec 2006 0:21Modified:5 Apr 2007 19:42 Reporter:Ryan KorczykowskiEmail Updates: Status:ClosedImpact on me: None Category:MySQL Server: Memory storage engineSeverity:S3 (Non-critical) ...
( col1 int,primary key using btree(col1)) engine=memory; delimiter // drop PROCEDURE delete_test // CREATE PROCEDURE delete_test() BEGIN SET @pos = 0; WHILE 1000000 > @pos DO INSERT INTO test_delete VALUES ( @pos ); SET @pos = @pos +1; END WHILE; END; // delimiter ; call ...