TheDELETEstatement deletes one or more rows from a table permanently. Here’s the syntax of theDELETEstatement: DELETEFROMtableWHEREcondition;Code language:SQL (Structured Query Language)(sql) In this syntax: First, specify the name of the table from which you want to delete data in theDELETE...
Warning: The important part of this syntax is theWHEREclause, as this is what allows you to specify exactly what rows of data should get deleted. Without it, a command likeDELETE FROMtable_name;would execute correctly, but it would delete every row of data from the table. Be aware that ...
UPDATE- 更新数据库中的数据 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 以下是一些常用的...
syntaxsql -- SQL Server SyntaxALTERDATABASE{database_name|CURRENT} {MODIFYNAME=new_database_name|COLLATEcollation_name|<file_and_filegroup_options>|SET<option_spec>[ ,...n ] [WITH<termination>] } [;]<file_and_filegroup_options>::=<add_or_modify_files>::=<filespec>::=<add_or_modify...
UPDATE - updates data in a database DELETE - deletes data from a database INSERT INTO - inserts new data into a database CREATE DATABASE - creates a new database ALTER DATABASE - modifies a database CREATE TABLE - creates a new table ALTER TABLE - modifies a table DROP TABLE - delet...
syntaxsql -- Syntax for Azure Synapse Analytics and Microsoft Fabric[WITH<common_table_expression>[ ,...n ] ]DELETE[database_name. [ schema ] . | schema. ]table_nameFROM[database_name. [ schema ] . | schema. ]table_nameJOIN{<join_table_source>}[ ,...n ]ON<join_condition>[WHERE...
To delete all the rows from the employee table, the query would be like, DELETE FROM employee; SQL TRUNCATE StatementThe SQL TRUNCATE command is used to delete all the rows from the table and free the space containing the table.Syntax to TRUNCATE a table:TRUNCATE TABLE table_name; ...
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CREATEINDEX-创建索引(搜索键)DROPINDEX-删除索引 (该部分转自https://www.w3school.com.cn/sql/sql_syntax.asp) ...
syntaxsql -- Syntax for Azure Synapse Analytics and Microsoft Fabric[WITH<common_table_expression>[ ,...n ] ]DELETE[database_name. [ schema ] . | schema. ]table_nameFROM[database_name. [ schema ] . | schema. ]table_nameJOIN{<join_table_source>}[ ,...n ]ON<join_condition>[WHERE...
DDL(Data Definition Language,数据定义语言) CREATE : 创建数据库和表等对象 DROP : 删除数据库和表等对象 ALTER : 修改数据库和表等对象的结构DML(Data Manipulation Language,数据操纵语言) SELECT :查询表中的数据 INSERT :向表中插入新数据 UPDATE :更新表中的数据 DELETE :删除表中的数据DCL...