ALTER TABLE is used to modify tables, including modifying table definitions, renaming tables, renaming specified columns in tables, renaming table constraints, setting table schemas, enabling or disabling row-l
-- add phone column to Customers tableALTERTABLECustomersADDphonevarchar(10); Run Code 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 ...
ALTER TABLE t_quality_inspection ADD COLUMN logr_dev decimal(20,5), ADD COLUMN p10gc decimal(20,5) 1. 报错如下: you have an error in your SQL syntax;check the manual that corresponds to your MySQL server version for the right syntax to use near (20,5) ADD COLUMN p10gc decimal(20,...
The ALTER TABLE command allows you to add, modify, or drop a column from an existing table. Adding column(s) to a table Syntax #1 To add a column to an existing table, the ALTER TABLE syntax is: ALTER TABLE table_name ADD column_name column-definition; For example: ALTER TABLE supplie...
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 MODIFYCOLUMNcolumn_name datatype; ...
Syntax #1 To add a column to an existing table, the ALTER TABLE syntax is: 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. ...
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_...
syntaxsql Copy ALTER TABLE { database_name.schema_name.table_name | schema_name.table_name | table_name } { ALTER COLUMN column_name { [ type_schema_name. ] type_name [ ( { precision [ , scale ] | max | xml_schema_collection } ) ] [ COLLATE collation_name ] [ NULL | NOT ...
ALTER TABLE employee DROP location; Syntax to modify a columnALTER 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); ...
syntaxsql コピー ALTER TABLE { database_name.schema_name.table_name | schema_name.table_name | table_name } { ALTER COLUMN column_name { [ type_schema_name. ] type_name [ ( { precision [ , scale ] } ) ] [ COLLATE collation_name ] [ NULL | NOT NULL ] } | ALTER INDEX inde...