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Слайды и текст этой презентации

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Data Modeling and Databases II - The Relational Data Model and SQL Week 3 - Tutorial

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In this tutorial More Complex SQL Retrieval Queries Specifying Constraints as Assertions and Actions as Triggers Views (Virtual Tables) in SQL Schema Change Statements in SQL

Слайд 3

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More Complex SQL Retrieval Queries Comparisons Involving NULL and Three-Valued Logic: SQL uses a three-valued logic with values TRUE, FALSE, and UNKNOWN instead of the standard two-valued (Boolean) logic with values TRUE or FALSE

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More Complex SQL Retrieval Queries Nested Queries, Tuples, and Set/Multiset Comparisons:

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More Complex SQL Retrieval Queries How to kill the DBMS performance? You can use correlated subqueries, i.e. when the inner query is filtered by values from the outer query)

Слайд 6

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More Complex SQL Retrieval Queries How to kill the DBMS performance? You can use correlated subqueries, i.e. when the inner query is filtered by values from the outer query)

Слайд 7

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More Complex SQL Retrieval Queries The EXISTS and UNIQUE Functions in SQL EXISTS and UNIQUE are Boolean functions that return TRUE or FALSE; hence, they can be used in a WHERE clause condition.

Слайд 8

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More Complex SQL Retrieval Queries NATURAL JOINS, INNER JOIN, OUTER JOIN, LEFT {OUTER} JOIN, RIGHT {OUTER} JOIN