Determining data types
The columns table of the INFORMATION_SCHEMA database also allows us to extract information about the data types of columns in a table. We can extract information like the character or string length of a CHAR or VARCHAR column or the precision of a DECIMAL or NUMERIC floating point type.
Using the techniques you learned in the lesson, let's explore the customer table of our DVD Rental database.
This exercise is part of the course
Functions for Manipulating Data in PostgreSQL
Exercise instructions
- Select the column name and data type from the
INFORMATION_SCHEMA.COLUMNSsystem database. - Limit results to only include the
customertable.
Hands-on interactive exercise
Have a go at this exercise by completing this sample code.
-- Get the column name and data type
SELECT
___,
___
-- From the system database information schema
FROM ___.COLUMNS
-- For the customer table
WHERE table_name = ___;