SQL Quick Reference From W3Schools« Previous Next Chapter » SQL StatementSyntax AND / OR SELECT column_name(s) FROM table_name WHERE condition AND|OR condition ALTER TABLE ALTER TABLE table_name ADD column_name datatype or ALTER TABLE table_name DROP COLUMN column_name AS (alias) ...
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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...
DELETE - 从数据库中删除数据 INSERT INTO - 向数据库中插入新数据 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 ❮...
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SQL StatementSyntax AND / OR SELECT column_name(s)FROM table_nameWHERE conditionAND|OR condition ALTER TABLE ALTER TABLE table_name ADD column_name datatype or ALTER TABLE table_name DROP COLUMN column_name AS (alias) SELECT column_name AS column_aliasFROM table_name or SELECT column_name...
W3Schools. SQL Tutorial. Free and available without registration. Database documentation: MySQL documentation PostgreSQL documentation SQLite - SQL syntax IBM DB2 SQL reference Microsoft SQL Server technical documentation Oracle Database SQL reference SQL commands quick reference: DDL: CREATE, ALTER, DROP...
SQL Cheat Sheet: For more advanced learners, go through this article for standard SQL syntax used in PostgreSQL. By the time you are finished, you will know a lot more about SQL and will be prepared to use it for business analysis and other tasks. ...
SQL Tutorial——w3schools (示例教程)入门之后,就要多学学T-SQL语言了。除了51自学网的SQL Server数据库教程外,w3schools是一个很好的资源库,它不止讲解T-SQL语言的知识点,还有一个在线的示例数据库提供给用户,可以随时随地进行练习。 Head First SQL——Head First系列(文字教程)因为是文字教程,所以贴的是豆瓣...