ALTER TABLE table_name ADD column_name column-definition; For example: ALTER TABLE supplier ADD supplier_name varchar2(50); This will add a column calledsupplier_nameto thesuppliertable. Syntax #2 To add multipl
To add multiple columns to an existing table, the ALTER TABLE syntax is: ALTER TABLE table_name For example: ALTER TABLE supplier This will add two columns (supplier_nameandcity) to thesuppliertable. Modifying column(s) in a table Syntax #1 To modify a column in an existing table, the A...
We can also add multiple columns at once to a table. For example, -- add phone and age columns to Customers tableALTERTABLECustomersADDphonevarchar(10), ageint; Here, the SQL command adds thephoneandagecolumns to theCustomerstable. Note:Since our compiler uses SQLite, it does not support ...
>ALTERTABLEStudentInfoADDIFNOTEXISTSPARTITION(age=18)PARTITION(age=20);-- After adding multiple partitions to the table>SHOWPARTITIONSStudentInfo; partition---age=11 age=12 age=15 age=18 age=20-- ALTER or CHANGE COLUMNS>DESCRIBEStudentInfo; col_name data_typecomment+---+---+---namestr...
To add multiple columns to a table in a single command, you specify the ADD keyword and column details again: ALTERTABLEcustomerADDsuburbVARCHAR(100),ADDpostcodeVARCHAR(20); You can add other data types, such as numbers as well. ALTERTABLEcustomerADDcredit_valueINT; ...
ALTER TABLE modifies a table definition by altering, adding, or dropping columns and constraints. ALTER TABLE also reassigns and rebuilds partitions, or disables and enables constraints and triggers.
ALTER TABLE modifies a table definition by altering, adding, or dropping columns and constraints. ALTER TABLE also reassigns and rebuilds partitions, or disables and enables constraints and triggers.
The column cannot be added if the increase in the total byte count of the columns exceeds the maximum row size. The maximum row size for the table is eight less than the maximum record size as described in Maximum record size.If you add a LOB column and the table does not already have...
USEDATABASETestReferenceDB;// Add a columnALTERTABLELogsADDCOLUMNeventNamestring;// add another columnALTERTABLELogsADDCOLUMNresultint;// drop a column and add another oneALTERTABLELogsDROPCOLUMNresult;ALTERTABLELogsADDCOLUMNclientIdstring;// drop a column and add 3 more columnsALTERTABLELogsDROPCOLU...
public boolean supportsAlterTableWithAddColumn() 返回值 如果支持,则值为 true。 否则为false。 例外 SQLServerException 备注 此supportsAlterTableWithAddColumn 方法是由 java.sql.DatabaseMetaData 接口中的 supportsAlterTableWithAddColumn 方法指定的。