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SQL. Problems and Solutions

Introduction
Common mistakes in solving SELECT statement exercises
SQL data manipulation language
- SELECT statement
- Data modification statements
Prepare for the second stage of testing
New sql features
Notes about data types
Data Definition Language (SQL DDL)
Optimizing
Graph databases
- SQL Server graph databases
- Querying graph database data
Appendixes
Finally
List of cited sources

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SQL. Problems and Solutions

Optimizing

Optimizing

SQL Server query plan explanation
PostgreSQL query plan explanation
Oracle query plan explonation
MySQL. Usage of query variables

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