In SQL Server we can run a query against the sys.computed_columns system catalog view to return all computed columns and their definitions.
Tag: computed columns
3 Ways to Check if a Table has a Generated Column in SQLite
If you’re not sure if a table has a generated column in SQLite, you can quickly find out with either the .schema command, or by querying the sqlite_schema table.
How to Return the Definition of a Generated Column in MariaDB
If you have a table in MariaDB with a generated column, you can use the following methods to find out its definition.
Continue reading5 Ways to Check if a Table has a Generated Column in MariaDB
Here are five ways to see whether a table contains a generated column in MariaDB.
Continue readingAdd a Virtual Column to an Existing Table in Oracle
If we need to add a virtual column to an existing table in Oracle Database, we can do so with the usual SQL ALTER TABLE statement.
5 Ways to See if a Table has a Generated Column in MySQL
MySQL supports generated columns. If you’re not sure whether a table has a generated column or not, you can check it using any of the following methods.
Continue readingHow to Create a Generated Column in MariaDB
A generated column is a database column whose value is an expression. Therefore, the value of the generated column is usually derived (for example, it could be derived from values in other columns).
Generated columns are also sometimes referred to as computed columns or virtual columns.
Creating a generated column in MariaDB is essentially the same as creating a normal column. The difference is that the definition of the generated column contains an expression that determines the column’s value.
Continue reading2 Ways to Check if a Table has a Generated Column in PostgreSQL
PostgreSQL has supported generated columns since version 12. Generated columns can be created easily with the CREATE TABLE and ALTER TABLE statements.
We can check whether a table contains a generated column or not with the following methods.
Continue readingFix “cannot add a STORED column” in SQLite
If you’re trying to add a generated column in SQLite, and you’re getting the “cannot add a STORED column” error, it’s probably because you’re trying to add a stored column.
In SQLite, we can only add virtual columns to existing tables.
Continue reading3 Ways to Get the Definition of a Generated Column in SQLite
When we have a table with a generated column, here are two methods we can use to return its definition.
Continue reading