You can delete an existing index in a table with the DROP INDEX statement. 你可以将现有的索引通过DROP INDEX语句进行取消操作。 Syntax for Microsoft SQLJet (and Microsoft Access): 在Microsoft SQLJet (和 Microsoft Access)中的语法是这样
syntaxsql复制 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。
in a future version of SQL Server. Avoid using this syntax in new development work, and plan to modify applications that currently use the feature. Use the syntax specified under<drop_relational_or_xml_or_spatial_index>instead. XML indexes can't be dropped using backward compatible syntax. ...
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。
Transact-SQL 语法约定 备注 Azure Synapse Analytics 中的无服务器 SQL 池不支持此语法。 语法 syntaxsql 复制 DROP SYMMETRIC KEY symmetric_key_name [REMOVE PROVIDER KEY] 参数 symmetric_key_name 要删除的对称密钥的名称。 REMOVE PROVIDER KEY 从EKM 设备中删除可扩展密钥管理 (EKM) 密钥。 有关可扩展...
New Drop If Exists Syntax in SQL Server 2016 Working with DEFAULT constraints in SQL Server Best practices for SQL Server database ALTER table operations Make your SQL Server database changes backward compatible when dropping a column SQL Server ALTER COLUMN Operations – Add Column...
syntaxsql -- 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...
SyntaxDROP DATABASE databasename; Note: Be careful before dropping a database. Deleting a database will result in loss of complete information stored in the database!DROP DATABASE ExampleThe following SQL statement drops the existing database "testDB":...
SYNTAX === CREATE UNDO TABLESPACE --- MySQL should support the UNDO keyword in the following syntax: CREATE UNDO TABLESPACE `undo99` ADD DATAFILE 'undo99.ibu'; The datafile can be a file name only or it can be a full absolute path. But it must end with the suffix ".ibu". If a ...
DROP DATABASESyntax DROP DATABASE [IF EXISTS] db_name DROP DATABASEdrops all tables in the database and deletes the database. If you do aDROP DATABASEon a symbolic linked database, both the link and the original database are deleted.Be very careful with this command!