DELETE FROM table_name WHERE 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...
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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-...
Tablestudents+id INT+name VARCHAR(30) 流程图: flowchart TD start[开始] --> create_table[创建表结构] create_table --> add_constraint[添加字符长度约束] add_constraint --> end[结束] 通过上述示例,我们可以清晰地看到如何在SQL Server中添加字符长度约束,以及其作用和方法。 结论 通过本文的介绍,相信...
DELETE * FROM table_name (Note:Deletes the entire table!!) DROP DATABASEDROP DATABASE database_name DROP INDEXDROP INDEX table_name.index_name (SQL Server) DROP INDEX index_name ON table_name (MS Access) DROP INDEX index_name (DB2/Oracle) ...
« W3Schools Home Next Chapter » SQL SQL is a standard language for accessing databases. Our SQL tutorial will teach you how to use SQL to access and manipulate data in: MySQL, SQL Server, Access, Oracle, Sybase, DB2, and other database systems....
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...
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EXCEPT (used in SQL server) and MINUS (Oracle specific) both have the same function. The function is to select all distinct rows selected by the first query but not the second. To understand this operator, consider the following table: ...
W3Schools:提供免费的SQL教程和示例代码。 数据库系统的官方文档:MySQL、PostgreSQL、SQL Server等都有自己的详细文档,涵盖了各自的特定功能和语法。 通过遵循上述指南和利用可用的工具和资源,你应该能够更有效地检测和修正SQL语法错误,从而提高你的SQL编程技能和数据管理能力。©...