http://www.dba-oracle.com/t_alter_table_modify_column_syntax_example.htm For complete tips on Oracle alter table syntax, see the book "Easy Oracle Jumpstart". Oracle provides "alter table" syntax to modify data columns in-place in this form: alter table table_name modify column_name datat...
http://dba-oracle.com/t_alter_table_modify_column_syntax_example.htm For complete tips on Oracle alter table syntax, see the book "Easy Oracle Jumpstart". Oracle provides "alter table" syntax to modify data columns in-place in this form: alter table table_name modify column_name datatype;...
http://www.dba-oracle.com/t_alter_table_modify_column_syntax_example.htm For complete tips on Oracle alter table syntax, see the book "Easy Oracle Jumpstart". Oracle provides "alter table" syntax to modify data columns in-place in this form: alter table table_name modify co...
Syntaxalter_table::= Text description of alter_table Groups of ALTER TABLE syntax: alter_table_clauses::= alter_table_partitioning::= alter_column_clauses::= alter_constraint_clauses::= alter_column_properties::= alter_external_table_clause::= move_table_clause::= enable_disable_...
To change the data type of a column in a table, use the following syntax: SQL Server / MS Access: ALTER TABLE table_name ALTER COLUMN column_name datatype My SQL / Oracle: ALTER TABLE table_nameMODIFY column_name datatype 增加约束. ...
Syntax ALTER TABLEtable-Name{ ADD COLUMNcolumn-definition| ADDCONSTRAINT clause| DROP [ COLUMN ] column-name [ CASCADE | RESTRICT ] DROP { PRIMARY KEY | FOREIGN KEY constraint-name | UNIQUE constraint-name | CHECK constraint-name | CONSTRAINT constraint-name } ...
ALTER TABLE - ALTER/MODIFY DATATYPE To change the data type of a column in a table, use the following syntax: SQL Server / MS Access: ALTERTABLEtable_name ALTERCOLUMNcolumn_name datatype; My SQL / Oracle (prior version 10G): ALTERTABLEtable_name ...
ALTER TABLE table_name ADD ( column_name_1 data_type constraint, column_name_2 data_type constraint, ... ); Code language: SQL (Structured Query Language) (sql) In this syntax, you separate two columns by a comma. Oracle ALTER TABLE ADD column examples ...
In this syntax: First, specify the name of table from which you want to modify a column in the ALTER TABLE clause. Second, prorivde the column name and action you want to perform in the MODIFY clause. Oracle allows you to perform many actions: ...
Here, the SQL command adds a column namedphoneto theCustomerstable. ALTER TABLE Syntax The syntax of the SQLALTER TABLEstatement is: ALTERTABLEtable_name clause supporting_codes; Here, table_nameis the name of the table to be modified