You can specify NOT NULL in ALTER COLUMN only if the column contains no null values. The null values must be updated to some value before the ALTER COLUMN NOT NULL is allowed, for example: SQL Copy UPDATE MyTable SET NullCol = N'some_value' WHERE NullCol IS NULL; ALTER TABLE My...
其中包括用户定义类型变量或函数以及用户定义函数,但不能引用 Transact-SQL 语句。 partition_number 必须存在,否则,该语句将失败。 WITH ( <single_partition_rebuild_index_option> ) SORT_IN_TEMPDB、MAXDOPDATA_COMPRESSION 和XML_COMPRESSION 是在REBUILD 单个分区 (PARTITION = partition_number) 时可指定的选项。
Flink SQL> show databases; +---+ | database name | +---+ | default_database | | alan_test | +---+ 2 rows in set Flink SQL> ALTER database default_catalog.alan_test set('createdate'='2023-11-20'); [INFO] Execute statement succeed. Flink SQL> show databases; +---+ | data...
Fill factor values 0 and 100 are the same in all respects. An explicit FILLFACTOR setting applies only when the index is first created or rebuilt. The Database Engine does not dynamically keep the specified percentage of empty space in the pages. For more information, seeCREATE INDEX (Transact...
()' <sql_values_node_path_item> ::= <node_path> AS SQL <sql_type> [SINGLETON] <node_path> ::= character_string_literal <xsd_type_ext> ::= character_string_literal <sql_type> ::= identifier <path_name> ::= identifier <xmlnamespace_list> ::= <xmlnamespace_item> [, <xmlname...
ValuesInsertSource VariableMethodCallTableReference VariableReference VariableTableReference VariableValuePair ViewDistributionOption ViewDistributionPolicy ViewForAppendOption ViewHashDistributionPolicy ViewOption ViewOptionKind ViewRoundRobinDistributionPolicy ViewStatementBody WaitAtLowPriorityOption WaitForOption WaitForSta...
ALTER INDEX修改索引是否可见,当索引状态为INVISIBLE时,SQL 优化器将不会选择该索引。 ADD [PARTITION]为分区表增加分区。 OceanBase 数据库不支持将非分区表修改为分区表。 DROP {PARTITION | SUBPARTITION}删除分区: PARTITION:针对 Range、List 类型的一级分区,删除指定分区(如果指定分区下存在二级分区,会同时删除该...
* SQL Server * SQL 托管实例 语法 syntaxsql ALTERDATABASEdatabase_name{<add_or_modify_files>|<add_or_modify_filegroups>}<add_or_modify_files>::={ADDFILE<filespec>[ ,...n ] [TOFILEGROUP{filegroup_name} ] |ADDLOGFILE<filespec>[ ,...n ] |REMOVEFILElogical_file_name|MODIFYFILE<filespec...
For more information, see SORT_IN_TEMPDB Option For Indexes.IGNORE_DUP_KEY = { ON | OFF }Specifies the error response when an insert operation attempts to insert duplicate key values into a unique index. The IGNORE_DUP_KEY option applies only to insert operations after the index is created...
1 or >= the number of instances in the cluster. (Values other than 1 have no effect on the active or standby status of any instances.) Oracle9i Real Application Clusters You must set this parameter for every instance, and multiple instances must have the same value. Note: This param...