DELETE [FROM] table [WHERE condition]; 1.使用WHERE 子句指定删除的记录,如果省略WHERE子句,则表中的全部数据将被删除。 SQL> DELETE FROM emp WHERE empno = 1234; 1 row deleted. 2.在DELETE 中使用子查询 在DELETE 中使用子查询,使删除基于另一个表中的数据。 SQL> DELETE FROM emp 2 WHERE deptno =...
Delete操作用于删除表中的数据行,其基本语法如下: DELETEFROMtable_nameWHEREcondition; 1. 其中,table_name为要删除数据的表名,condition为删除数据的条件。执行Delete操作会删除满足条件的数据行。 关联表 在数据库设计中,通常会存在多个表之间的关联关系。例如,两个表之间可能存在主外键关系,即一个表的某一列与另...
http://dev.mysql.com/doc/refman/8.0/en/with.html.Single-TableSyntaxDELETE[LOW_PRIORITY][QUICK][IGNORE]FROMtbl_name[PARTITION (partition_name [, partition_name]...)][WHERE where_condition][ORDER BY ...][LIMIT row_count]TheDELETEstatement deletes rowsfromtbl_nameandreturnsthenumberofdeleted r...
DELETE FROM Customers WHERE customer_id = 4; Run Code Here, the SQL command will delete a row from the Customers table if its customer_id is 4. DELETE Syntax The syntax of the SQL DELETE command is: DELETE FROM table_name [WHERE condition]; Here, table_name is the name of the tabl...
-- Syntax for Parallel Data WarehouseDELETE[FROM[database_name. [ schema ] . | schema. ]table_name] [WHERE<search_condition>] [OPTION(<query_options>[ ,...n ] ) ] [; ] 参数 WITH common_table_expression<> 指定在 DELETE 语句作用域内定义的临时命名结果集,也称为公用表表达式。 结果集源...
SQL命令 DELETE(一) 大纲 代码语言:javascript 代码运行次数:0 运行 AI代码解释 DELETE[%keyword][FROM]table-ref[[AS]t-alias][FROM[optimize-option]select-table[[AS]t-alias]{,select-table2[[AS]t-alias]}][WHEREcondition-expression]DELETE[%keyword][FROM]table-ref[[AS]t-alias][WHERECURRENTOF...
with_query_name [ ( column_name [, ...] ) ] AS ( {select | values | insert | update | delete} ) 关键要点如下: 每个CTE的AS语句指定的SQL语句,必须是可以返回查询结果的语句,可以是普通的SELECT语句,也可以是INSERT、UPDATE、DELETE、VALUES等其它语句,需要通过RETURNING子句返回元组。例如: ...
DELETE 语句 DELETE语句用于执行删除语句,可以将数据库中的一行或者多行删除,也可以选择只删除当前游标列。 语法如下所示: EXECSQLDELETEFROM[WHERE(condition|CURRENTOF<cursor>)] DELETE语句的语法遵循 OceanBase Oracle 模式中DELETE语句的语法规则。其中CURRENT OF <cursor>表示更新当前游标所指向的列,其中参数cursor表...
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 FROMclause. Second, specify a condition in theWHEREclause filter rows to delete. If you omit theWHEREclause, ...
DELETE 语句可以用 WITH 子句开头,定义在 DELETE 中可访问的公用表表达式。 单表语法 1. DELETE [LOW_PRIORITY] [QUICK] [IGNORE] FROM tbl_name [[AS] tbl_alias] 2. [PARTITION (partition_name [, partition_name] ...)] 3. [WHERE where_condition] ...