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...
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 SQL constraints for 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...
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DELETE FROM table_nameWHERE some_column=some_value or DELETE FROM table_name (Note: Deletes the entire table!!) DELETE * FROM table_name (Note: Deletes the entire table!!) DROP DATABASE DROP DATABASE database_name DROP INDEX DROP INDEX table_name.index_name (SQL Server)DROP INDEX ind...
CREATE TABLE TheCREATE TABLEcommand 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 CREATETABLEPersons ( PersonID int,...
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 DATABASE - 创建新数据库 ALTER DATABASE - 修改数据库 CREATE TABLE - 创建新表 ALTER TABLE - 变更(改变)数据库表 DROP TABLE - 删除表 CREATE INDEX - 创建索引(搜索键) DROP INDEX - 删除索引 SQL 语句对大小写不敏感 星号(*)是选取所有列的快捷方式 ...
SQL 数据定义语言 (DDL)SQL 的数据定义语言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: CREATE TABLE - 创建新表 ALTER TABLE - 变更(改变)数据库表 DROP TABLE - 删除表 CREATE INDEX - 创建索引(搜索键) DROP INDEX - 删除...