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parvu.org | ||
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sqlmaria.com
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| | | | | Although there have been a number of significant changes to the Oracle Database in 12c, some of my favorite new features are actually the small enhancements, designed to make your life a little eas... | |
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www.binovarghese.com
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| | | | | To find the constraints in a table ALL_CONSTRAINTS: Provides information about all constraints accessible to the user, across all tables in the database. It includes constraint types, status, and more, but doesn't show column-specific details. | |
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buttondown.com
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| | | | | In a SQL database, you can set up a foreign key with REFERENCES: nullbitmap=# CREATE TABLE ab (a INT PRIMARY KEY, b INT); CREATE TABLE nullbitmap=# INSERT... | |
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postgrespro.com
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| | | In previous articles we discussed query execution stages and statistics . Last time, I started on data access methods, namely Sequential scan . Today we will cover Index Scan. This article requires a basic understanding of the index method interface. If words like "operator class" and "access method properties" don't ring a bell, check out my article on indexes from a while back for a refresher. Plain Index Scan Indexes return row version IDs (tuple IDs, or TIDs for short), which can be handled in one of... | ||
