CREATE TABLE <table_name>( column1 data_type[(size)], column2 data_type[(size)], ...); Parameters: Best Practices for SQL CREATE TABLE Statements Here are some important points and tips about the "SQL CREATE TABLE" statement: Table Name:Choose a descriptive and relevant name for your t...
SELECT *INTO new_table_name [IN externaldatabase] FROM old_tablename或者只把希望的列插入新表:SELECT column_name(s)INTO new_table_name [IN externaldatabase] FROM old_tablename11.SQL CREATE DATABASE 语句KeyWords 创建数据库12.SQL CREATE TABLE 语句KeyWords 创建表...
A set of SQLconstraintsfor each table. SQLite supports UNIQUE, NOT NULL, CHECK and FOREIGN KEY constraints. A unique indexes will automatically create to enforce a UNIQUE or PRIMARY KEY constraint. and they cannot be manually dropped with the DROP INDEX command. Table of contents Naming Conventio...
DROP INDEX DROP INDEX table_name.index_name (SQL Server)DROP INDEX index_name ON table_name (MS Access)DROP INDEX index_name (DB2/Oracle)ALTER TABLE table_nameDROP INDEX index_name (MySQL) DROP TABLE DROP TABLE table_name EXISTS IF EXISTS (SELECT * FROM table_name WHERE id = ?)BEGIN-...
To create a new table in a database To insert data into a table To join a table To delete a table from a databaseSubmit Answer » What is an Exercise? Test what you learned in the chapter: SQL Create Table by completing 5 relevant exercises. To try more SQL Exercises please visit...
2.Write a SQL statement to create a simple table countries, including columns country_id,country_name and region_id which already exist. Sample Solution: Code: -- This SQL statement creates a new table called 'countries' with specified columns. ...
You answered: True Correct Answer! 24. Which operator is used to search for a specified pattern in a column? You answered: LIKE Correct Answer! 25. Which SQL statement is used to create a table in a database? You answered: CREATE TABLE Correct Answer!分类...
CREATE TABLEThe CREATE TABLE command creates a new table in the database. The following SQL creates a table called "Persons" that contains five columns: PersonID, LastName, FirstName, Address, and City:Example CREATE TABLE Persons ( PersonID int, LastName varchar(255), FirstName varchar(255...
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SQL的数据定义语言(DDL)部分使我们有能力创建或删除表格。我们也可以定义索引（键），规定表之间的链接，以及施加表间的约束。 SQL中最重要的DDL语句: *CreateDATABASE-创建新数据库 *AlterDATABASE-修改数据库 *CreateTABLE-创建新表 *AlterTABLE-变更（改变）数据库表 *DropTABLE-删除表