Revenue analytics and unit economics Order of SQL commands execution in a query with JOINs

95. Order of SQL commands execution in a query with JOINs

We’re not far away from learning all possible SQL keywords. I hope you remember all steps of they execution by heart. Let’s go over them to make sure it’s the case:

  1. FROM is checked first, SQL engine will know from which table to read records first
  2. JOIN goes second. The records from JOIN tables are also read and joined with our main table ☝
  3. WHERE comes next – we filter the records from the final big table
  4. GROUP BY splits final big table into smaller groups
  5. SELECT is processed next, columns and results of all functions are calculated
  6. DISTINCT...
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Anatoli Makarevich, author of SQL Habit About SQL Habit

Hi, it’s Anatoli, the author of SQL Habit. 👋

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