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2 Μαρ 2016 · You can't dictate the data type for the output column of a view. The best you can do is as @buckley suggested - use CAST or CONVERT to force an explicit data type inline in the view definition. – Aaron Bertrand. May 22, 2012 at 23:44.
ALTER VIEW view_name AS SELECT columns FROM tables WHERE conditions; Here, view_name is the name of the view that you want to alter. The SELECT statement following the AS keyword defines the new query that will be used to redefine the view. You can change the columns selected, add new conditions, or modify any other part of the original query.
For example, if permissions are granted on the SalesOrderID column in a CREATE VIEW statement, an ALTER VIEW statement can rename the SalesOrderID column, such as to OrderRef, and still have the permissions associated with the view using SalesOrderID.
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 (prior version 10G): ALTER TABLE table_name. MODIFY COLUMN column_name datatype; Oracle 10G and later: ALTER TABLE table_name.
create view view2 as select [column1], (null) as column2 varchar(10) from view1; I get an error in the third line. If I leave the query like this, without specifying the data type for Column2, the query works, but the default data type will be int, whereas I want to have VARCHAR.
SQL Server allows you to perform the following changes to an existing column of a table: Modify the data type. Change the size. Add a NOT NULL constraint. Modify column’s data type. To modify the data type of a column, you use the following statement: ALTER TABLE table_name . ALTER COLUMN column_name new_data_type(size);
22 Σεπ 2021 · We can use ALTER TABLE ALTER COLUMN statement to change the column type of the table. The syntax to change the column type is following: 1. ALTER TABLE [tbl_name] ALTER COLUMN [col_name_1] [DATA_TYPE] In the syntax, Tbl_name: Specify the table name. Col_name: Specify the column name whose datatype you want to change.
