11/23/2023 0 Comments Mysql delete column to table![]() ![]() ![]() In this tutorial, you have learned how to use the SQL Server ALTER TABLE DROP COLUMN statement to remove one or more columns from a table. Also, to drop multiple columns, you have to separate them by commas and include the DROP for each one. Note that the COLUMN keyword is optional, as MySQL will accept just DROP IsDeleted. ![]() The following example deletes two columns discount and surcharge at once: ALTER TABLE sales.price_lists 790 ALTER TABLE tblCountry DROP COLUMN IsDeleted Here's a working example. To drop the price column, first, delete its CHECK constraint: ALTER TABLE sales.price_listsĪnd then, delete the price column: ALTER TABLE sales.price_lists Here is the error message: The object 'ck_positive_price' is dependent on column 'price'. If you try to execute the following statement, you will get an error: ALTER TABLE sales.price_lists This will delete the table as well as any data stored within it. The price column has a CHECK constraint, therefore, you cannot delete it. If you want to delete a table, you can use the DROP TABLE SQL statement. The following statement drops the note column from the price_lists table: ALTER TABLE sales.price_lists Price DEC( 10, 2) NOT NULL CONSTRAINT ck_positive_price CHECK(price >= 0), Let’s create a new table named sales.price_lists for the demonstration. SQL Server ALTER TABLE DROP COLUMN examples In this syntax, you specify columns that you want to drop as a list of comma-separated columns in the DROP COLUMN clause. If you want to delete multiple columns at once, you use the following syntax: ALTER TABLE table_nameĭROP COLUMN column_name_1, column_name_2. The DROP COLUMN command is used to delete a column in an existing table. Also, SQL Server does not allow you to delete a column that has a PRIMARY KEY or a FOREIGN KEY constraint. Note that the COLUMN keyword is optional, as MySQL will accept just DROP IsDeleted. Step 1: Create MySQL Database and Table The first step is to create a database and a table to show the method above. If the column that you want to delete has a CHECK constraint, you must delete the constraint first before removing the column. ALTER TABLE tblCountry DROP COLUMN IsDeleted Heres a working example.
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