Tag Archives: sql

I big data sono passati di moda?

Posted on February 10, 2023 by Giovanni Giorgi
Questo articolo, di tal Jordan Tigani, getta una luce oscura sul futuro dei big data. E’ scritto dal CEO di un’azienda che sviluppa un nuovo database OLAP (Online analytical processing) chiamato Duckdb, che e’ open source ed e’ “embedded”, nel … Continue reading →
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SQLite, again (updated)

Posted on June 22, 2021 by Giovanni Giorgi
SQLite is slowing becoming a new standard. It is fast, and has a growing number of features. Useful settings PRAGMA journal_mode = wal; PRAGMA foreign_keys = true; Query, set, or clear the enforcement of foreign key constraints. PRAGMA busy_timeout=….; In milliseconds, … Continue reading →
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SQL: One of the most valuable skills – Craig Kerstiens

Posted on February 20, 2019 by Giovanni Giorgi
I admit it. I suffered from an “algebra narcoleptic syndrome” during my relational database lessons at University (1996 circa). Ok it is a fake. But it seems so real on these days. I was unable to avoid sleeping. I learned … Continue reading →
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Outer full and inner SQL joins: you are wellcome

Posted on August 27, 2018 by Giovanni Giorgi
For a complete description see https://www.codeproject.com/Articles/33052/Visual-Representation-of-SQL-Joins
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SQLite Oracle Compatibility Layer

Posted on August 7, 2018 by Giovanni Giorgi
  It aims to provide a minimal compatibility with Oracle. The need was having some regular expression functions, and I do not like to work with risky C code, like this university project did Github link: https://gitlab.com/daitangio/sqlite_ora_functions
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Removing duplicate rows in PostgreSQL, Oracle and SQLite

Posted on June 16, 2017 by Giovanni Giorgi
Sometimes you need to remove nasty duplicate on a table, based on a subset of the column. On every big database there is something called “rowid” which can be used to indentify a column in a unique way. On PostgreSQL … Continue reading →
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Oracle SQL Developer Keep Alive plugin

Posted on January 26, 2017 by Giovanni Giorgi
On some environment, on some customers, Oracle connections are drop after some idle time (i.e. 2 minutes). I have found a small plugin for Sql Developer to solve this issue: it is very handy and logs its usage. Code is also … Continue reading →
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