FOREIGN KEY: MySQL supports the foreign keys. A table can have more than one foreign key that references the primary key of different tables MySQL Create Table example If you want to create a table using MySQL
MySQL allows you to create the primary key when you create the table using the CREATE TABLEstatement. To create a PRIMARY KEY constraint for the table, you specify the PRIMARY KEY in the primary key column’s definition. The following example creates users table whose primary key is user_id...
mysql create table primary key auto_increment mysql> create table ss(id intunsignednot nullprimary key auto_increment, user_namevarchar(15)not null); Query OK, 0 rows affected (0.00 sec) mysql> mysql>insert into ss(id,user_name) values(1, 'jojo'); Query OK, 1 row affected (0.00 sec...
cats Create Table: CREATE TABLE `cats` ( `id` int(10) unsigned NOT NULL AUTO_INCREMENT, `name` varchar(150) NOT NULL, `gender` char(1) DEFAULT NULL, `owner` varchar(150) NOT NULL, `birth` date NOT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=latin1...
[KEY]] [[PRIMARY] KEY] [COMMENT 'string'] [reference_definition] } data_type: (see Chapter 11, Data Types) key_part: col_name [(length)] [ASC | DESC] index_type: USING {BTREE | HASH} index_option: { KEY_BLOCK_SIZE [=] value | index_type | WITH PARSER parser_name | COMMENT...
PRIMARY KEY (col1,col2,...) Example of MySQL CREATE TABLE statement Let’s practice with an example of creating a new table namedtasksin our sample database as follows: You can use theCREATE TABLEstatement to create thetaskstable as follows: ...
CREATE TABLE `test` ( `id` int(11) NOT NULL, `name` varchar(200) NOT NULL, `address` varchar(1000) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4; 需要手动去es中创建索引,比如这里使用es-head创建,如下图: image test索引结构如下: { "mappings":{ "_doc":...
DROP TABLE IF EXISTS todo; CREATE TABLE todo (id SERIAL PRIMARY KEY, description VARCHAR(255), details VARCHAR(4096), done BOOLEAN); 建立新的 Todo Java 類別。 這個類別是一個映射到 todo 數據表的領域模型,該數據表將由 Spring Boot 自動建立。 下列程式代碼會忽略getters和setters方法。...
CREATE TABLE J_TEACHER ( tno int NOT NULL PRIMARY KEY, tname varchar(20) NOT NULL ); INSERT INTO J_TEACHER(tno,tname)VALUES(1,‘张老师’); INSERT INTO J_TEACHER(tno,tname)VALUES(2,‘王老师’); INSERT INTO J_TEACHER(tno,tname)VALUES(3,‘李老师’); INSERT INTO J_TEACHER(tno,t...
CREATETABLE`users` (`uuid`char(36)NOT NULL,`created_at`datetimeNOT NULL,`updated_at`datetimeNOT NULL,`email`varchar(255)NOT NULL,`name`textNOT NULL,--- CUT ---`enabled`tinyint(1)NOT NULLDEFAULT1,`stamp_exception`textDEFAULTNULL,PRIMARY KEY(`uuid`), UNIQUE KEY`email`(`email`) ) ENGI...