Αποτελέσματα Αναζήτησης
31 Μαρ 2014 · ALTER TABLE table_name MODIFY column_name datatype AFTER another_column_name; or ALTER TABLE table_name MODIFY column_name datatype BEFORE another_column_name;
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.
The basic syntax for the ALTER VIEW statement is as follows: 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.
For views created with VIEW_METADATA, the browse-mode metadata returns the view name and not the base table names when it describes columns from the view in the result set. When a view is created by using WITH VIEW_METADATA, all its columns, except a timestamp column, are updatable if the view has INSERT or UPDATE INSTEAD OF triggers.
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);
5 Μαρ 2020 · Introduction. The primary goal will be to get familiar with the ALTER VIEW command used to modify views and change the output. A view is based on the result set from a query, and this command allows us to change the structure and definition of a query.
12 Δεκ 2019 · Problem. Please present a quick summary of some T-SQL statements for creating, dropping, and changing views. Also, clarify when I might want to use a view for T-SQL application development. Finally, give some demonstrations of T-SQL code for creating, dropping, modifying, and using views. Solution.
