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SQL Basics Cheat Sheet SQL, or Structured Query Language, is a language to talk to databases. It allows you to select specific data and to build complex reports. Today, SQL is a universal …

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To refer to a column in the JOIN query, you have to use the full column name: first the table name, then a dot (.) and the column name: ON cat.cat_id = toy.cat_id You can omit the table …

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