Example 10: How to add check Constraint using ALTER command in SQL The basic syntax for adding check constraints in a table is like this ALTERTABLEtable_nameADDCONSTRAINTMyUniqueConstraintCHECK(CONDITION); This is all aboutALTER command examples in SQL. We have seen 10 different examples of usin...
SQL Server 2016 and later Analysis Services Azure Analysis Services Fabric/Power BI Premium Alters an existing object, but not its children. If the object does not exist, the command raises an error. UseAltercommand for targeted updates, like setting a property on a table without having to spe...
You can use an ALTER command in SQL Server 2000 and 7.0 to modify almost every kind of object that you can create with a CREATE command (e.g., database, procedure, view). For most objects, ALTER is a better choice than using DROP and CREATE to change an object, mainly because using...
You can also use the COLLATE clause in the ALTER TABLE command when appropriate (primary key or foreign key). FieldType [(nFieldWidth [, nPrecision])] Specifies the field type, field width, and field precision (number of decimal places) for the new or modified field. FieldType is a ...
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。
Some data type changes may cause a change in the data. For example, changing an nchar or nvarchar column to char or varchar may cause the conversion of extended characters. For more information, see CAST and CONVERT (Transact-SQL). Reducing the precision or scale of a column may cause data...
For rowgroups in which 10% or more of the rows have been logically deleted, SQL Server tries to combine this rowgroup with one or more rowgroups. For example, rowgroup 1 is compressed with 500,000 rows and rowgroup 21 is compressed with the maximum of 1,048,576 rows. Rowgroup 21 ha...
Reimport the CLOB and SQL NCHAR columns. Restrictions: You must have SYSDBA system privilege, and you must start up the database in restricted mode (for example, with the SQL*Plus STARTUP RESTRICT command). The current character set must be a strict subset of the character set to whic...
In SQL Server 2005 or later, the state of a database file (for example, online or offline), is maintained independently from the state of the database. For more information, seeFile States. The state of the files within a filegroup determines the availability of the whole filegroup. For ...
Moving and Renaming Tablespaces: Example This example moves and renames a data file associated with thetbs_02tablespace, created in"Enabling Autoextend for a Tablespace: Example", fromdiskb:tbs_f5.dbftodiska:tbs_f5.dbf: Take the tablespace offline using anALTERTABLESPACEstatement with theOFFLINEcl...