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ponjavic
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Isn't possible to delete and remove columns after a table has been created?
Rows works just fine but columns don't...
Rows works just fine but columns don't...
so-crates said:You can, but its not considered a good thing to do, except possibly when prototyping. This is because you are altering your schema, which shouldn't happen. Would you want to alter the form of a data structure at runtime?
SQL stands for Structured Query Language, and it is a programming language used for managing and manipulating data in relational databases.
The purpose of removing columns after table creation using SQL is to modify the structure of a table by removing unnecessary columns or adding new ones. This allows for more efficient data management and storage.
To remove a column from a table using SQL, you can use the ALTER TABLE command followed by the DROP COLUMN option and the name of the column you want to remove. For example, ALTER TABLE table_name DROP COLUMN column_name;
Yes, you can remove multiple columns at once using SQL by separating the column names with a comma after the DROP COLUMN option. For example, ALTER TABLE table_name DROP COLUMN column1, column2, column3;
No, once a column has been removed from a table using SQL, it cannot be undone. However, you can create a new column with the same name and data type if needed.