是为了建立索引 PRIMARY KEY (`id`) USING BTREE, UNIQUE KEY `sku_id` (`id`) USING BTREE, KEY `id_order` (`order_id`) USING BTREE, KEY `tb_sku_purchase_id_IDX` (`purchase_id`) USING BTREE, KEY `tb_sku_stream_IDX` (`stream`) USING BTREE ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb...
求翻译:UNIQUE KEY `code` (`code`) USING BTREE是什么意思?待解决 悬赏分:1 - 离问题结束还有 UNIQUE KEY `code` (`code`) USING BTREE问题补充:匿名 2013-05-23 12:21:38 唯一键`代码`(`代码`)使用的btree 匿名 2013-05-23 12:23:18 唯一的关键字“代码”(“代码”)使用二叉树 匿名 20...
dept varchar(64) CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci NOT NULL COMMENT '部门', PRIMARY KEY (id) USING BTREE, INDEX idx_name_age_dept(name, age, dept) USING BTREE ) ENGINE = InnoDB AUTO_INCREMENT = 1 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_general_ci COMMENT = '...
`city`varchar(255)DEFAULTNULL,PRIMARYKEY (`id`),UNIQUEKEY `UNIQUE_KEY` (`name`,`city`)USINGBTREE ) ENGINE=InnoDB AUTO_INCREMENT=5DEFAULTCHARSET=utf8mb4COLLATE=utf8mb4_0900_ai_ci; id是主键,name和city是一个组合Unique_key,现在插入一条数据: INSERT INTO`employee`(`name`,`age`,`city`) V...
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, ...); ...
`gen_create_datetime` varchar(14) CHARACTER SET utf8 COLLATE utf8_bin GENERATED ALWAYS AS (date_format(`create_time`,get_format(DATETIME, _utf8mb4'INTERNAL'))) STORED UNIQUE KEY `organ_id` (`organ_id`,`gen_create_datetime`(12),`del_flag`) USING BTREE...
下面建个表测试下，uin 字段类型 int，可以看到 explain 的 type 都是 const.然后把 uin 改成 char ...
Possibly related issues #80 and #69. Using version 2.2.4. My requirement is to create a unique constraint on multiple columns of a single table where one of the columns is a nullable foreign key (C# Guid? / pg uuid). I first tried the fo...
CREATE TABLE book ( id integer NOT NULL, name text NOT NULL, ); ALTER TABLE ONLY book ADD CONSTRAINT book_name_key UNIQUE (name); CREATE INDEX book_name_like ON book USING btree (name text_pattern_ops); Please correct me if I'm wrong. My conclusion is that databases enforce unique...
UNIQUE INDEX `idx_username`(`username` ASC, `update_time` ASC, `tenant_id` ASC) USING BTREE PRIMARY KEY (`id`) USING BTREE ) ENGINE = InnoDB AUTO_INCREMENT = 127 CHARACTER SET = utf8mb4 COLLATE = utf8mb4_unicode_ci COMMENT = '用户信息表'; -- --- 0 comments on commit 2a9aa35...