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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.

What is an inner join in SQL? And what is an outer join?

by Hans-Jürgen Schönig | 09.2022
A join is a concept in IT which is widely used and often referred to but rarely really understood. What […]

ERROR: nextval: reached maximum value of sequence

by Hans-Jürgen Schönig | 09.2022
serial is a popular pseudo data type in PostgreSQL which is often used to generate auto-increment columns. However, this can […]

ALTER TABLE ... ADD COLUMN … done right in PostgreSQL

by Hans-Jürgen Schönig | 08.2022
Running ALTER TABLE … ADD COLUMN can have side effects which have the potential to cause serious issues in production. […]

How to corrupt your PostgreSQL database

by Laurenz Albe | 08.2022
Of course most people do not want to corrupt their databases. These people will profit from avoiding the techniques used […]

Better SQL functions in PostgreSQL v14

by Laurenz Albe | 07.2022
We all know and value SQL functions as a handy shortcut. PostgreSQL v14 has introduced a new, better way to […]

Column order in PostgreSQL does matter

by Hans-Jürgen Schönig | 07.2022
I've recently seen some really broad tables (hundreds of columns) in a somewhat inefficiently structured database. Our PostgreSQL support customer […]

Handling Bonus Programs in SQL

by Hans-Jürgen Schönig | 07.2022
Bonus cards, “Miles & more”, bonus points - don’t we all love and hate them at the same time? Recently […]

Transaction anomalies with SELECT FOR UPDATE

by Laurenz Albe | 06.2022
  I was recently confronted with a nice example of how adding FOR UPDATE to a query can introduce transaction […]

Case-insensitive pattern matching in PostgreSQL

by Laurenz Albe | 06.2022
    Case-insensitive search is a much-requested feature, partly (I suspect) to maintain compatibility with Microsoft SQL Server. There are […]

Time zone management in PostgreSQL

by Laurenz Albe | 05.2022
  Next to character encoding, time zones are among the least-loved topics in computing. In addition, PostgreSQL's implementation of timestamp […]
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