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Learn SQL

Querying relational data, from the PostgreSQL tutorial.

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PostgreSQL Tutorial

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Mark The SQL language done
The SQL languagebeginner
PostgreSQL: The SQL language
sql basics relational database concepts sql tables rows
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Mark Creating and populating tables done
Creating and populating tablesbeginner
PostgreSQL: Creating a new table
sql create table sql insert sql data types
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Mark Querying a table done
Querying a tablebeginner
PostgreSQL: Querying a table
sql select sql where sql order by
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Mark Joins between tables done
Joins between tablesintermediate
PostgreSQL: Joins between tables
sql joins inner join left join sql foreign key
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Mark Aggregate functions done
Aggregate functionsintermediate
PostgreSQL: Aggregate functions
sql group by sql count sum avg sql having
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Mark Updates and deletes done
Updates and deletesintermediate
PostgreSQL: Updates
sql update sql delete sql set where
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Mark Transactions done
Transactionsadvanced
PostgreSQL: Transactions
sql transactions commit rollback acid
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