The data type of the column. C# 复制 public Microsoft.SqlServer.TransactSql.ScriptDom.DataTypeReference DataType { get; set; } Property Value DataTypeReference Applies to 产品版本 Microsoft.SQLServer.DacFx 140.3881.1, 150.18208.0, 160.2004021.0, 161.6374.0, 161 本文内容 Definiti...
Based on thecustomerstable below, change thecustomer_namecolumn to NOT allow null values and change thestatecolumn to a varchar2(2) datatype. CREATE TABLE customers Solution: The following ALTER TABLE statement would modify thecustomer_nameandstatecolumns accordingly in thecustomerstable: ALTER TABLE...
Here, the SQL command changes the column name ofcustomer_idtoc_idin theCustomerstable. Modify the Data Type of a Column We can also change the column's data type using theALTER TABLEcommand withMODIFYorALTER COLUMNclause. For example, SQL Server ALTERTABLECustomersALTERCOLUMNageVARCHAR(2); MyS...
Change Data Type Example Now we want to change the data type of the column named "DateOfBirth" in the "Persons" table. We use the following SQL statement: ALTERTABLEPersons ALTERCOLUMNDateOfBirth year; Notice that the "DateOfBirth" column is now of type year and is going to hold a ye...
Use the ALTER TABLE statement to alter the definition of a nonpartitioned table, a partitioned table, a table partition, or a table subpartition. For object tables or relational tables with object columns, use ALTER TABLE to convert the table to the latest definition of its referenced type ...
Use theMOUNTclause to mount the database. Do not use this clause when the database is mounted. MOUNT STANDBY DATABASE SpecifyMOUNTSTANDBYDATABASEto mount a physical standby database. As soon as this statement executes, the standby instance can receive archived redo logs from the primary instance...
Overview: SQL Server In SQL Server, this statement modifies a database, or the files and filegroups associated with the database. ALTER DATABASE adds or removes files and filegroups from a database, changes the attributes of a database or its files and filegroups, changes the database coll...
Overview: SQL Server In SQL Server, this statement modifies a database, or the files and filegroups associated with the database. ALTER DATABASE adds or removes files and filegroups from a database, changes the attributes of a database or its files and filegroups, changes the database coll...
ALTER TABLE table_name MODIFY column_name datatype; For Example: To modify the column salary in the employee table, the query would be likeALTER TABLE employee MODIFY salary number(15,2); SQL RENAME CommandThe SQL RENAME command is used to change the name of the table or a database ...
Specifies the value of the SQL authorization ID of the process at the time of an SQL data change statement or LOAD, as the default for the column. If CURRENT SQLID is specified, the data type of the column must be a character string with a length attribute greater than or equal to the...