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PostgreSQL Development Essentials

You're reading from   PostgreSQL Development Essentials Advanced querying, data modeling and performance tuning

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Product type Paperback
Published in Sep 2016
Publisher Packt
ISBN-13 9781783989003
Length 210 pages
Edition 1st Edition
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Author (1):
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Baji Shaik Baji Shaik
Author Profile Icon Baji Shaik
Baji Shaik
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Table of Contents (12) Chapters Close

Preface 1. Advanced SQL FREE CHAPTER 2. Data Manipulation 3. Triggers 4. Understanding Database Design Concepts 5. Transactions and Locking 6. Indexes and Constraints 7. Table Partitioning 8. Query Tuning and Optimization 9. PostgreSQL Extensions and Large Object Support 10. Using PHP in PostgreSQL 11. Using Java in PostgreSQL

Using the LIMIT clause

The LIMIT clause is used to retrieve a number of rows from a larger data set. It helps fetch the top n records. The LIMIT and OFFSET clauses allow you to retrieve just a portion of the rows that are generated by the rest of the query from a result set:

SELECT select_list
FROM table_expression
[LIMIT { number | ALL }] [OFFSET number]

If a limit count is given, no more than that many rows will be returned (but possibly fewer, if the query itself yields fewer rows). LIMIT ALL is the same as omitting the LIMIT clause.

The OFFSET clause suggests skipping many rows before beginning to return rows. OFFSET 0 is the same as omitting the OFFSET clause. If both OFFSET and LIMIT appear, then the OFFSET rows will be skipped before starting to count the LIMIT rows that are returned.

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PostgreSQL Development Essentials
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PostgreSQL Development Essentials
Published in: Sep 2016
Publisher: Packt
ISBN-13: 9781783989003
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