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Tag: sql help

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Here you can find all blog posts about the Tag: sql help. You can go back to all blog posts or take a look into our other categories & tags.

PostgreSQL: Trivial timeseries examples

by Hans-Jürgen Schönig | 08.2019
How to use the PostgreSQL function lag() and corr() - see basic examples and get familiar with window functions for trivial timeseries.

1-to-1 relationship in PostgreSQL for real

by Pavlo Golub | 05.2019
How to implement 1-to-1 relationship in PostgreSQL? Tricks with UNIQUE constraints? Check how to achive that using DEFERRABLE foreign keys.

Triggers to enforce constraints in PostgreSQL

by Laurenz Albe | 04.2019
  Sometimes you want to enforce a condition on a table that cannot be implemented by a constraint. In such […]

DECLARE CURSOR in PostgreSQL or how to reduce memory consumption

by Hans-Jürgen Schönig | 04.2019
This blogpost is about using cursors in PostgreSQL, their purpose and limitations and what DECLARE CURSOR and FETCH have to do with it.

PostgreSQL count(*) made fast

by Laurenz Albe | 04.2019
  It is a frequent complaint that count(*) is so slow on PostgreSQL. In this article I want to explore […]

unaccent: Getting rid of umlauts, accents and special characters

by Hans-Jürgen Schönig | 03.2019
Unaccent is a useful PostgreSQL extension for improving user experience. Get insight into this extension and its purpose.

Looking at MySQL 8 with PostgreSQL goggles on

by CYBERTEC Guest | 02.2019
Compare MySQL 8 and PostgreSQL for available features, general querying experience and documentation clarity.

Implementing “AS OF”-queries in PostgreSQL

by Hans-Jürgen Schönig | 02.2019
Many databases such as Oracle provide "AS OF" queries (timetravel). This blog explains how to do time travel in PostgreSQL.

Keyword mess

by Pavlo Golub | 01.2019
In this blog posting we will tell you more about how to use keywords exactly in PostgreSQL and e.g. what keywords may be used as object names

A PostgreSQL story about "NULL IS NULL = NULL AND NOT NULL"

by Hans-Jürgen Schönig | 12.2018
Why the word "unknown" is better to describe a NULL value than "empty". Learn to use NULL values correctly in PostgreSQL.
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