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egghead.io

Understand Joins and Unions in Postgres

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You know the basics of Postgres, but most meaningful queries will require you to combine tables in novel ways to ask questions you couldn't ask with a single table alone. Joins and unions come up over and over again in interview questions -- because of how fundamental they are. This course will make you a master of your tables, and give you the power to answer questions you couldn't before.

Syllabus

  • Find Postgres Data That Doesn’t Match Join Conditions with Full Outer Join
  • Find Postgres Data That Doesn’t Match Join Conditions with Full Outer Join
  • Find Postgres Data That Doesn’t Match Join Conditions with Full Outer Join
  • Find Lonely Postgres Data with Left and Right Join
  • Detect Duplicates in Postgres with Cartesian Product
  • Find Related Data with Inner Join in Postgres
  • See All Rows from Different Postgres Tables with Union All
  • Join Tables in Postgres with Complex Conditions
  • Create a History Table in Postgres with Joins
  • Use Joins to Detect Orphaned Data in Postgres
  • Find Lonely Postgres Data with Left and Right Join
  • Find Lonely Postgres Data with Left and Right Join
  • Detect Duplicates in Postgres with Cartesian Product
  • Detect Duplicates in Postgres with Cartesian Product
  • Find Related Data with Inner Join in Postgres
  • Find Related Data with Inner Join in Postgres
  • See All Rows from Different Postgres Tables with Union All
  • See All Rows from Different Postgres Tables with Union All
  • Join Tables in Postgres with Complex Conditions
  • Join Tables in Postgres with Complex Conditions
  • Create a History Table in Postgres with Joins
  • Create a History Table in Postgres with Joins
  • Use Joins to Detect Orphaned Data in Postgres
  • Use Joins to Detect Orphaned Data in Postgres

Taught by

Brett Cassette

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