task 'wizard task' has failed with error:.There was an error while applying the SQL script to the database. 11:34:53 [ERR][SQL Editor Form]: Error 1064: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to ...
FOREIGN KEY (`jos_users_id`) REFERENCES `jos_users` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION) ENGINE = InnoDB DEFAULT CHARSET=utf8; This returns: #1005 - Can't create table '.\jo152\lfa_organizations.frm' (errno: 150) ...
26 PRIMARY KEY (`id`) 27 ) ENGINE=InnoDB AUTO_INCREMENT=7 DEFAULT CHARSET=utf8; 28 29 ALTER TABLE files ADD CONSTRAINT files_users_fk FOREIGN KEY(`user_id`) REFERENCES users(`id`); 可以看出 files 依赖表users ,依赖表不能先删除。也就是说,需要先删除当前表,再删除外键关联表 我们来看看概...
CREATE TABLE `district` ( `id` INT AUTO_INCREMENT PRIMARY KEY, -- 主键,自动增长 `name` VARCHAR(50) NOT NULL, -- 区县的名称 `code` VARCHAR(10) NOT NULL, -- 区县的行政区划代码 `city_id` INT NOT NULL, -- 外键,关联市的 `id` FOREIGN KEY (`city_id`) REFERENCES `city`(`id`) O...
mysql> HELP ‘CREATE TABLE’; #输入帮助语句，查看命令内容。Name: ‘CREATE TABLE’Description:Syntax:CREATE [TEMPORARY] TABLE [IF NOT EXISTS] tbl_name(create_definition,…)[table_options]CREATE [TEMPORARY] TABLE [IF NOT EXISTS] tbl_name[(create_definition,…)][table_options][partition_options]...
As of MySQL 5.x, InnoDB is the only MySQL database engine that supports foreign keys. (You might be able to use the foreign key syntax with other MySQL database engines, but InnoDB is the only database engine that actually uses the information you define in your CREATE TABLE statements....
# 创建数据表 非空约束 not null mysql> create table tb_user3( id int, username varchar(20) not null # 非空约束 ) engine=innodb default charset=utf8mb4; 3. 唯一约束 UNIQUE 约束唯一标识数据库表中的每条记录。 UNIQUE 和 PRIMARY KEY 约束均为列或列集合提供了唯一性的保证。 PRIMARY KEY 拥有...
CREATE TABLE IF NOT EXISTS employees ( id INT AUTO_INCREMENT PRIMARY KEY, first_name VARCHAR(50) NOT NULL, last_name VARCHAR(50) NOT NULL, hire_date DATE NOT NULL, salary DECIMAL(10, 2) NOT NULL )""" try: cursor.execute(create_table_query) ...
create bitmap index idx_name on table(col_name) 位图的基本思想就是对每一个条件都用0或者1来表示,如有5条记录,性别分别是男,女,男,男,女,那么如果使用位图索引就会建立两个位图,对应男的10110和对应女的01001,这样做有什么好处呢,就是如果同时对多个这种类型的字段进行and或or查询时,可以使用按位与和按...
I am creating two tables then doing an alter table to add a foreign key constraint and it gives the following error: Error Code: 1005. Can't create table 'mydb.#sql-870_16' (errno: 150) Here is a simple test to prove it: