Tag: sql help

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ERROR: invalid byte sequence - Fix bad encoding in PostgreSQL

by Laurenz Albe | 05.2023
(Inscription seen on a T-shirt) It's annoying to get error messages caused by encoding problems. But it is more annoying […]

PostgreSQL ALTER DEFAULT PRIVILEGES - permissions explained

by Laurenz Albe | 05.2023
  Many people have heard that ALTER DEFAULT PRIVILEGES makes it easy to allow other users access to tables. But […]

Forcing a join order in PostgreSQL

by Laurenz Albe | 05.2023
  Different from many other database systems, PostgreSQL does not support query hints. That makes it difficult to force the […]

Underscores in numeric constants in PostgreSQL 16

by Pavlo Golub | 04.2023
SQL and numeric constants NEW in PostgreSQL 16 - support for underscores in integer and numeric constants! I already wrote […]


by Laurenz Albe | 04.2023
  A while ago, I wrote about how difficult it is to get an execution plan for a parameterized query. […]

Row locks in PostgreSQL

by Laurenz Albe | 04.2023
  The PostgreSQL documentation has some information about row locks. But typically, you cannot see them in pg_locks, and not […]


by Hans-Jürgen Schönig | 03.2023
Data isn't only about storage and accumulation - sometimes it's also about deletion, cleanup and archiving. In SQL there's more […]

Breaking your PostgreSQL database with bad CHECK constraints

by Laurenz Albe | 03.2023
  I am on a spree! After writing about breaking your database and transaction ID wraparound, here I am writing […]

Stored procedures in PostgreSQL: getting started

by Hans-Jürgen Schönig | 02.2023
Stored procedures are a core concept which can be found in most relational database systems. They have proven to be […]

PostgreSQL: Finding the current timestamp

by Hans-Jürgen Schönig | 02.2023
PostgreSQL provides all kinds of time-related functions. But time is not as easy as it seems. One question many people […]
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