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][IGNORE | REPLACE][AS] query_expressionCREATE [TEMPORARY] TA...
drop database if exists mydata; //如果存在mydata则删除 create database mydata; //创建名为mydata的数据库 use mydata; //打开数据库mydata 1. 2. 3. 2、创建数据表 语法: CREATE TABLE table_name(col_name col_type col_attr, col_name col_type col_attr,……) 参数: 一个数据表,由多个列...
CREATETABLEusers(user_idINTAUTO_INCREMENT,usernameVARCHAR(50)NOTNULL,PRIMARYKEY(user_id));CREATETABLEflights(flight_idINTAUTO_INCREMENT,flight_numberVARCHAR(10)NOTNULL,PRIMARYKEY(flight_id));CREATETABLEorders(user_idINT,flight_idINT,order_dateDATETIMEDEFAULTCURRENT_TIMESTAMP,PRIMARYKEY(user_id,flight_...
If you want to set particular columns of the table as the primary key, you use the following syntax: 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 t...
If you want to set particular columns of the table as the primary key, you use the following syntax: 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: ...
一、数据库管理语句 1、Syntax: CREATE {DATABASE | SCHEMA} [IF NOT EXISTS] db_name [create_specification] ... create_specification: [DEFAULT] CHARACTER SET [=] ch
mysql> create table uu(id int unsigned not null primary key auto_increment, user_name varchar(15) not null)auto_increment=100; Query OK, 0 rows affected (0.01 sec) mysql> === mysql>insert into uu(id,user_name) values(1, 'jojo'); Query OK, 1 row affected (0.00 sec) mysql>...
CREATETABLEdb1.city(cityvarchar(50)NULL)ENGINE=InnoDBDEFAULTCHARSET=utf8COLLATE=utf8_general_ci; 1. 2. 3. 4. 5. 6. 表中会有这样的数据,读者可以按需下面的脚本创建随机的几百万条: 复制 INSERTINTOdb1.city(city)VALUES('London');INSERTINTOdb1.city(city)VALUES('Hiroshima');INSERTINTOdb1.cit...
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...
All data in p1 and p3 partitions are removed, but the table definition remains unchanged.C.A syntax error will result as you cannot specify more than one partition in the same statement.D.All data in pi and p3 partitions are removed and the table definition is changed.---答案:D在删除部分...