-- Syntax for SQL Server, Azure SQL Database, Warehouse in Microsoft FabricDROPTABLE[IFEXISTS] {database_name.schema_name.table_name|schema_name.table_name|table_name} [ ,...n ] [ ; ] syntaxsql -- Syntax for Azure Synapse Analytics and Parallel Data WarehouseDROPTABLE{database_name.sche...
The TRUNCATE TABLE statement is used to delete the data inside a table, but not the table itself.SyntaxTRUNCATE TABLE table_name; Exercise? What does the SQL DROP TABLE statement do? Deletes a table and all its data from the database Renames an existing table Copies a table and its ...
IF EXISTS 如果指定,當數據表不存在時,不會擲回任何 TABLE_OR_VIEW_NOT_FOUND 錯誤。 table_name 要刪除的資料表名稱。 名稱不得包含 時態規格或選項規格。如果找不到數據表,Azure Databricks 就會引發 TABLE_OR_VIEW_NOT_FOUND 錯誤。範例SQL 複製
The following script shows how the SampleTable in the TestReferenceDB database’s default schema is deleted if it already exists before it is recreated:U-SQL نسخ DROP TABLE IF EXISTS TestReferenceDB..SampleTable; CREATE TABLE TestReferenceDB..SampleTable AS (id int); ...
Next, you need to build a dynamicDROP TABLEstatement: -- build dynamic sql (DROP TABLE tbl1, tbl2...;) SELECT CONCAT('DROP TABLE ',GROUP_CONCAT(CONCAT(@schema,'.',table_name)),';') INTO @droplike FROM information_schema.tables WHERE @schema = database() AND table_name LIKE @patt...
This chapter explains how to create a table and how to insert data into it. The conventions of creating a table in HIVE is quite similar to creating a table using SQL. Create Table Statement Create Table is a statement used to create a table in Hive. The syntax and example are as follo...
Syntax drop_table::= Description of the illustration drop_table.eps Semantics IF EXISTS SpecifyingIF EXISTSdrops the table if it exists. UsingIF NOT EXISTSwithDROP TABLEresults inORA-11544: Incorrect IF EXISTS clause for ALTER/DROP statement. ...
删除表的基本SQL语法格式为: DROPTABLEtable_name;DROPTABLE[IFEXISTS] table_name; DROP TABLE table_name;删除一个名为 table_name的表 DROP TABLE IF EXISTS table_name;执行了这条语句如果存在table_name表就删除,不存在不会报错也是执行。 mysql> show tables; ...
适用范围:SQL Server(SQL Server 2016 (13.x) 到当前版本、SQL 数据库)。 只有在视图已存在时才对其进行有条件地删除。 schema_name 视图所属架构的名称。 view_name 要删除的视图的名称。 注解 删除视图时,将从系统目录中删除视图的定义和有关视图的其他信息。 还将删除视图的所有权限。 使用DROP TABLE 删除...
syntaxsql DROPINDEXindex_nameON{database_name.schema_name.table_name|schema_name.table_name|table_name} [ ; ] 参数 IF EXISTS 适用于:SQL Server 2016 (13.x) 及更高版本。 仅当索引已存在时对其进行有条件地删除。 index_name 要删除的索引的名称。