Common Table Expression Basics
Learn the basics of how CTEs work with a few examples in this article.
2023-05-31 (first published: 2023-05-19)
5,811 reads
sabyda
- Skills: Java, Spring boot, React, Azure, AWS, Postgres, Oracle, Websphere, Angular, Blockchain, Corda
Establishing a Connection to PostgreSQL with GoLang
Learn how to use golang to connect to a PostgreSQL database.
2022-07-22
17,749 reads
Array and Custom Data Types in PostgreSQL
Introduction Just like every other database, PostgreSQL has its own set of basic datatypes, like Boolean, Varchar, Text, Date, Time, etc. We can easily store data like numbers, characters, date, time, etc. using these supported datatypes, but what if we need to store multiple data elements in a single column? Suppose we are storing the […]
2021-09-10
13,242 reads
Conditional DELETE and INSERT in PostgreSQL
Introduction We are comfortable with inserting/deleting record(s) into/from a table. But we sometimes get confused when we need to insert or delete records conditionally from a table. Let us look at an example. Example scenario Suppose we have a table, called ALL_EMPLOYEES, which contains all employees' information who are working or had ever worked for […]
2021-06-18 (first published: 2021-05-12)
10,686 reads
Getting a Query Execution Plan in PostgreSQL
Introduction You often need to check the performance of a PostgreSQL query you just wrote to look for some way to improve performance. In order to do this, you need a report of the query execution, which is called the execution plan). The query execution plan gives you the entire summary of the query execution […]
2021-03-18
9,346 reads
The CAST operator in PostgreSQL
Introduction Cast is a technique in PostgreSQL with which we can convert a value of one datatype into another. We can perform various cast operations in PostgreSQL for converting one datatype to another, such as the String datatype to the Integer datatype (or the Boolean datatype or datetime datatype) and vice versa. This article will […]
2021-01-21
76,006 reads
Rules in PostgreSQL
We sometimes need to perform a different/alternative actions during database queries. We need it for data protection or data abstraction. The PostgreSQL rule system allows to define an alternative action on insert, update or delete. A rule generates an extra query. As a result, rule execution impacts the performance of the system. Creating Rules A […]
2020-12-03
8,949 reads
Getting Started with Gremlin
Apache TinkerPop is an open source graph computing framework. A graph computing network is a set of vertices and edges in the network. If we compare a graph database to traditional relational databases, we can assume that every row in a table of a relational database is equivalent to a vertex in graph network. Similarly, […]
2020-10-15
3,992 reads
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Question of the Day
Query Plan Regressions --
For the Question of the day, I am going to go deep, but try to be more clear, as I feel like I didn't give enough info last time, leading folks to guess the wrong answer... :) For today's question: You’re troubleshooting a performance issue on a critical stored procedure. You notice that a previously efficient query now performs a full table scan instead of an index seek. Upon investigating, you find that an NVARCHAR parameter is being compared to a VARCHAR column in the WHERE clause. What is the most likely cause of the query plan regression?
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