How do I modify a column in Sybase?
Sybase Alter Table Change Column Type. The RazorSQL alter table tool includes a Change Column Type option for changing the data types of columns on Sybase database tables. The change column type function allows the user to choose a new type, a new length, and a new scale if appropriate for the data type chosen.
How do I add a column in Sybase?
Use the alter table command to add a column to an existing table. Use alter table to drop a column from an existing table. Use alter table to modify an existing column. You can modify any number of columns in a single alter table statement.
How do I rename a column in Sybase?
The RazorSQL alter table tool includes a Rename Column option for renaming an Sybase database table column. The rename column option allows the user to type in a new name for the column being renamed. The tool then generates and can execute the SQL to rename the column on the table.
How do I drop a column in Sybase?
The RazorSQL alter table tool includes a Drop Column option for dropping a column from a Sybase database table. The drop column function allows the user to select a column to drop from the table. The tool then generates the appropriate alter table drop column SQL command for dropping the column from the table.
How do I drop a constraint in Sybase?
The drop constraint function allows the user to enter a constraint to drop from the table. The tool then generates the appropriate alter table drop constraint SQL command for dropping the constraint from the table. Below is a screen shot of the drop constraint function of the Sybase alter table tool.
How do you add a column to the middle in Oracle?
By default, columns are only added at the end. To insert a column in the middle, you have to drop and recreate the table and all related objects (constraints, indices, defaults, relationships, etc).
How do I rename a Sybase database?
The RazorSQL alter table tool includes a Rename Table option for renaming an Sybase database table. The rename table option allows the user to type in a new name for the table being renamed. The tool then generates and can execute the SQL to rename the Sybase database table.
How do I drop index in Sybase?
To drop such indexes, drop the constraints through alter table or drop the table. See create table for more information about unique constraint indexes. You cannot drop indexes that are currently used by any open cursor. For information about which cursors are open and what indexes they use, use sp_cursorinfo.
How do I drop a column in SQL?
SQL Drop Column Syntax
- ALTER TABLE “table_name” DROP “column_name”;
- ALTER TABLE “table_name” DROP COLUMN “column_name”;
- ALTER TABLE Customer DROP Birth_Date;
- ALTER TABLE Customer DROP COLUMN Birth_Date;
- ALTER TABLE Customer DROP COLUMN Birth_Date;
How do I drop a foreign key in Sybase?
Dropping a Foreign Key
- Create the primary table and foreign table.
- When there is no role name assigned, the default role name for the specified foreign key is DEPT:
- If there are multiple foreign keys and the role name is unknown, you can use the sp_iqconstraint procedure to display it.
How do you add a column to the middle of a table?
By default, columns are only added at the end. To insert a column in the middle, you have to drop and recreate the table and all related objects (constraints, indices, defaults, relationships, etc). Several tools do this for you, and depending on the size of the table, this may be an intensive operation.
How do you alter column in SQL table?
Sometimes we need to change the data type of a column. To do this, we use the ALTER TABLE Modify Column command. For Oracle and MySQL, the SQL syntax for ALTER TABLE Modify Column is, ALTER TABLE “table_name”. MODIFY “column_name” “New Data Type”; For SQL Server, the syntax is, ALTER TABLE “table_name”.
What is ALTER TABLE command?
SQL ALTER TABLE Statement. The SQL ALTER TABLE command is used to modify the definition (structure) of a table by modifying the definition of its columns. The ALTER command is used to perform the following functions.
What is alter table in SQL?
The SQL ALTER TABLE statement is used to add, modify, or drop/delete columns in a table. The SQL ALTER TABLE statement is also used to rename a table.
How to alter table in SQL Server?
Modify column’s data type. The new data type must be compatible with the old one,otherwise,you will get a conversion error in case the column has data and it
