The SQL DROP TABLE StatementThe DROP TABLE statement is used to drop an existing table in a database.SyntaxDROP TABLE table_name; Note: Be careful before dropping a table. Deleting a table will result in loss of complete information stored in the table!
TRUNCATE statement: This command is used to delete all the rows from the table and free the space containing the table.SQL DROP Statement:The SQL DROP command is used to remove an object from the database. If you drop a table, all the rows in the table is deleted and the table ...
(Some legal select statement) 114 115 CREATE TABLE 以给定的名字在当前数据库创建一个表。允许的表名规则在章节 6.1.2 数据库、表、索引、列和别名 中被给出。如果没有当前数据库或表已经存在,一个错误将会发生。 116 117 在MySQL 3.22 或以后的版本中,表名可以被指定为 db_name.tbl_name。不管有没有当...
ThePREPAREstatement. Prepares the SQL statement stored in the@droptoolvariable. It sets up the command so it can be executed. TheEXECUTEstatement. Executes theDROP TABLEcommand, which deletes the specified tables. TheDEALLOCATEstatement. Frees up the resources associated with the prepared statement. ...
2、Flink SQL示例 1)、非分区表示例 2)、分区表 五、Flink SQL常见的操作示例 本文简单介绍了DROP、alter、insert和analyze的语法及示例 ,并且将FLink sql常用的sql以java 方法整理成一个类,可以直接在java中使用,或在Flink sql cli中直接使用。 本文依赖flink集群能正常使用。 本文示例java api的实现是通过Flink...
The SQL DROP DATABASE Statement TheDROP DATABASEstatement is used to drop an existing SQL database. Syntax DROPDATABASEdatabasename; Note:Be careful before dropping a database. Deleting a database will result in loss of complete information stored in the database!
TheDROP INDEXstatement doesn't apply to indexes created by definingPRIMARY KEYorUNIQUEconstraints. To remove the constraint and corresponding index, useALTER TABLEwith theDROP CONSTRAINTclause. Important The syntax defined in<drop_backward_compatible_index>will be removed in a future version of SQL Se...
SQL Server Azure SQL 数据库 Azure SQL 托管实例 从当前数据库中删除一个或多个 DML 或 DDL 触发器。 Transact-SQL 语法约定 语法 syntaxsql -- Trigger on an INSERT, UPDATE, or DELETE statement to a table or view (DML Trigger)DROPTRIGGER[IFEXISTS] [schema_name.]trigger_name[ ,...n ] [ ...
If the object exists, execute the drop table statement else, no actions required. 1 2 3 4 5 6 7 8 9 IFEXISTS ( SELECT* FROMsys.objects WHEREobject_id=OBJECT_ID(N'Department') ANDtypeIN(N'U') ) DROPTABLEDepartment; GO Alternatively, we can check the object id of the SQL table an...
When we use the DELETE statement without the WHERE clause, all table rows shall be deleted, but the table structure will remain the same. The syntax for the same is as below: DELETE FROM table_name; The delete statement is used in SQL to delete the current records in the table. Whenever...