SQL Data Types Analysts Actually Meet

By Ravindra Bagale Last updated: 31 October 2026

Lessons in this chapter:

6.1 TEXT, INTEGER, REAL and NUMERIC: A Plain Guide for Analysts
6.2 Why Money Should Not Be Floating-Point Guesswork
6.3 How SQLite Stores Dates and Times (Text, Not a Date Type)
6.4 How to Check Types with typeof() and Convert with CAST
6.5 Practice: Spot Wrong Types in Messy Bank Data (Read-Only)

Quiz for this chapter is available on the Learn tracker after deploy.

Ravindra Bagale's Tip

Finish every lesson example in DB Browser before the quiz.

Ravi Sir's Cards for this chapter

SQL data types you actually meet. Imported files often store numbers as text. Then totals and comparisons quietly go wrong.

Revision card How do you check the real type of a value in SQLite? I use the typeof() function. It returns text, integer, real, null or blob for each value.

Interview card REAL vs INTEGER cents for money. REAL stores a decimal number in floating point. INTEGER cents stores money as a whole number of cents or paise.

REAL vs INTEGER cents for money. REAL stores a decimal number in floating point. INTEGER cents stores money as a whole number of cents or paise.

Comparison card

All cards for this chapter