by Javier Morales Carreras | Mar 2, 2024 | Database
In 2019 they decided in Chile that the winter time adjustment would be 5 months, instead of the usual 3 months. Morocco also decided to move its time with respect to GMT from +00 to +01. These changes that you may think do not affect you in the least, unless you live...
by Javier Morales Carreras | Jan 25, 2024 | Database
This year 2024 is a leap year. SQL> SELECT LAST_DAY(TO_DATE(’01/02/2024′,’DD/MM/YYYY’)) FECHA FROM DUAL; FECHA —————————– Thursday, 29 February 2024 In fact, each year divisible by four is a leap year, but throughout history many adjustments occurred to the...
by Javier Morales Carreras | Oct 11, 2023 | GitHub projects
This one is about bad practices. The use of synonyms. If you have felt a cold sweat, you probably experienced something similar. Many users want to access application tables “transparently.” Note that I put it in quotes because calling...
by Javier Morales Carreras | May 19, 2023 | Off Topic
On May 9 I received an email from the organization of the #WorldInnovationDay Hack 2023 confirming that they had appointed me as a mentor for the Hackathon to be held from May 12 to 15. I mean, that same week. But, what is a Hackathon? It is a kind of technological...
by Javier Morales Carreras | Mar 14, 2023 | SQL
When you filter a column using a function, the optimizer does not use the indexes on that particular column because the function “transforms” the values and makes the index non useful to get the proper ROWIDs. To get around that hurdle, Oracle has...
