1) Deleting one row from a table The following statement deletes the employee with id 3 from theemployeestable: DELETEFROMemployeesWHEREemployeeID =3;Code language:SQL (Structured Query Language)(sql) 2) Deleting all rows from a table
这里我们将在 SQL DELETE 命令中使用 WHERE 子句来删除 MySQL 数据表 runoob_tbl 所选的数据。 实例 以下实例将删除 runoob_tbl 表中 runoob_id 为3 的记录: DELETE 语句: mysql> use RUNOOB; Database changed mysql> DELETE FROM runoob_tbl WHERE runoob_id=3; Query OK, 1 row affected (0.23 sec) ...
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...
mysql>useRUNOOB;Databasechangedmysql>DELETEFROMrunoob_tblWHERErunoob_id=3;QueryOK,1rowaffected(0.23sec) 使用PHP 脚本删除数据 PHP 使用 mysqli_query() 函数来执行SQL语句, 你可以在 DELETE 命令中使用或不使用 WHERE 子句。 该函数与mysql>命令符执行SQL命令的效果是一样的。 实例 以下PHP实例将删除 runoob...
table_name、view_name或rowset_function的别名,为方便起见而使用,或用于区分自联接或子查询中的表或视图。别名通常是一个缩短了的表名,用于在联接中引用表中的特定列。如果联接中的多个表中有相同名称的列存在,SQL Server 要求必须使用表名或别名来限定列名。(如果定义了别名则不能使用表名)。
一个可选关键字,可用在 DELETE 关键字与目标 table_or_view_name 或 rowset_function_limited 之间 。 table_alias 在表示要从中删除行的表或视图的 FROMtable_source子句中指定的别名。 server_name 适用于:SQL Server 2008 (10.0.x) 及更高版本。
SQL delete duplicate Rows using Common Table Expressions (CTE) We can use Common Table Expressions commonly known as CTE to remove duplicate rows in SQL Server. It is available starting from SQL Server 2005. We use a SQLROW_NUMBERfunction, and it adds a unique sequential row number for the...
row_count 指定待删除的表的行数。指定的值只能为整数。 table_references 多表删除时指定的待选择的表序列。 示例 示例表及数据基于以下定义: obclient> CREATE TABLE t1(c1 INT PRIMARY KEY, c2 INT); Query OK, 0 rows affected obclient> SELECT * FROM t1; +---+---+ | c1 | c2 | +---+-...
SQL DELETE Query - Learn how to effectively use the SQL DELETE query to remove records from your database with practical examples and in-depth explanations.
This query will work in all variations of SQL:Oracle,SQL Server,MySQL,PostgreSQL, and more. You’ll get an output like this: 1 row(s) deleted. Here’s what the table will look like after the row is deleted: Delete Multiple Rows in SQL ...