mysql>createdatabase test3;-- 创建数据库成功Query OK,1rowaffected (0.00sec) mysql>createdatabase test3;-- 再次创建数据库失败ERROR1007(HY000): Can't create database 'test3'; database exists mysql> create database if not exists test3; -- 语句执行成功 Query OK, 1 row affected, 1 warnin...
SQL Create DataBaseThe CREATE DATABASE Statement is used to create a database. After creating a database, we can create several other database objects (tables, views, procedures etc.) into it. The user should have admin privileges for creating database.:...
使用create database创建数据库: mysql>createdatabase test; ##创建数据库成功 Query OK,1rowaffected (0.08sec) mysql>createdatabase test; ##再次创建数据库失败 ERROR1007(HY000): Can't create database 'test'; database exists mysql> create database if not exists test; ##语句执行成功 Query OK,...
Lesson 1: Create and query database objectsArticle 11/23/2024 17 contributors Feedback In this article Prerequisites Create a database Create a table Insert and update data in a table Show 3 more Applies to: SQL Server Azure SQL Database Azure SQL Managed Instance Analytics Platform ...
createSQLQuery设置类 sqlquery创建表 一、使用前需要导入的模块 from PyQt5 import QtSql from PyQt5.QtSql import QSqlQuery 1. 2. 二、sqlite的创建 db=QtSql.QSqlDatabase.addDatabase("QSQLITE") db.setDatabaseName("mydatabase.db") 1. 2....
$sql='CREATE DATABASE RUNOON'; $retval=mysqli_query($conn,$sql); if(!$retval) { die('创建数据库失败: '.mysqli_error($conn)); } echo"数据库 RUNOON 创建成功\n"; mysqli_close($conn); ?> 执行成功后,返回如下结果: 如果数据库已...
SELECT name FROM sys.databases WHERE name = N'TutorialDB' ) CREATE DATABASE [TutorialDB] GO USE [TutorialDB] -- Create a new table called 'Customers' in schema 'dbo' -- Drop the table if it already exists IF OBJECT_ID('dbo.Customers', 'U') IS NOT NULL ...
在MySQL 中创建一个名为 test_db 的数据库。在 MySQL 命令行客户端输入 SQL 语句CREATE DATABASE test_db;即可创建一个数据库,输入的 SQL 语句与执行结果如下。 mysql> CREATE DATABASE test_db; Query OK, 1 row affected (0.12 sec); “Query OK, 1 row affected (0.12 sec);”提示中,“Query OK”...
在sql_parse.cc文件中,我们可以看到MySQL操作数据的相关命令的解析,例如CREATE DROP ALERT等命令,然后我们可以看到MySQL操作数据库的相关实现类。这里主要有两个类,sql_db.h和sql_db.cc 下面我们主要来看看下mysql_create_db方法,这个方法主要对应的命令就是我们上面提到的CREATE DATABASE。 我们查看源码。可以看到在...
To create the database, select OK. Use Transact-SQL Connect to the Database Engine. From the Standard bar, select New Query. Copy and paste the following example into the query window and select Execute. This example creates the database Sales. Because the keyword PRIMARY isn't used, the...