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PostgreSQL Install-Windows
A number of folks have asked me to create a post of a PostgreSQL installation on Windows. So, here is my step-by-step PostgreSQL 9.3 installation, and you can go further and learn how to setup your own...
View ArticlePostgreSQL New Database
How time flies, last March I explained how to install and configure PostgreSQL on Windows. It was my intent to start posting more content on PostgreSQL but I was distracted by another writing...
View ArticleFedora PostgreSQL Install
Somebody asked how to put PostgreSQL on my Fedora image with Oracle Database 11g and MySQL. It’s fairly simple. You can check for the current download at yum.postgresql.org and then download it like...
View ArticleA PL/pgSQL Function
Somebody wanted to know how to write a basic PostgreSQL PL/pgSQL function that returned a full name whether or not the middle name was provided. That’s pretty simple. There are principally two ways to...
View ArticlePostgreSQL Auto IDs
PostgreSQL’s approach to automatic numbering is as simple as Oracle but different than MySQL, and Microsoft SQL Server. For example, you have a two-step process with Oracle, PostgreSQL, MySQL, and...
View ArticlePostgreSQL Composites
PostgreSQL like Oracle supports record data types but unlike Oracle, PostgreSQL doesn’t support collections of record data types. Here’s an example of how to define a PostgreSQL composite data type,...
View ArticlePostgreSQL Identity Columns
It’s interesting to see the way different databases implement automatic numbering. Oracle Database 12c is the closest to PostgreSQL in some significant ways. However, its probably more accurate to say...
View ArticlePostgreSQL Calling File
Somebody asked: How do you run a script file from PostgreSQL’s psql prompt? I created two files to answer the question. Here are the two files: Static File SELECT 'Hello World!'; Dynamic File SELECT...
View ArticleJava and Postgres
I wanted to get Java working with PostgreSQL to test some GUI interfaces on Linux. Figuring out the necessary JAR file for the JDBC was my first hurdle. I found it was postgreSQL-42-2.5.jar file. You...
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DBeaver for PostgreSQL
I’m migrating my database classes from the Oracle database to the PostgreSQL database. Using the Oracle Express Edition has always required a virtualized image because students use Windows and Mac OS....
View ArticlePostgres Overloaded Routines
Earlier I showed how to write an anonymous block in PostgreSQL PL/pgSQL to drop routines, like functions and procedures. However, it would only work when they’re not overloaded functions or procedures....
View ArticlePostgreSQL and LPAD
While porting my Oracle code to PostgreSQL I encountered a little quirk. It’s probably not a quirk except for the fact that I’ve worked in Oracle so long. Oracle implicitly type casts so well that we...
View ArticleReading External File
I’m working on items for migrating my database class from Oracle to PostgreSQL. I ran into an interesting limitation when I tried using the COPY command to read an external CSV file. I had prepared the...
View ArticlePostgreSQL Upsert Intro
Oracle and SQL Server use the MERGE statement, MySQL uses the REPLACE INTO statement or ON DUPLICATE KEY, but PostgreSQL uses an upsert. The upsert isn’t a statement per se. It is like MySQL’s INSERT...
View ArticlePostgreSQL Upsert Advanced
Nine years after writing how to use the MERGE statement in Oracle, I am writing how you implement an UPSERT statement in PostgreSQL. I wrote an initial post going over the basics of PostgreSQL’s upsert...
View ArticlePostgreSQL WITH to INSERT
This demonstrates how you insert results from a common table expression (CTE) in a leading WITH clause. I thought it would be a nice add since the existing tutorials didn’t have an example. Create the...
View ArticlePostgreSQL Creating Schema
The process of creating a schema requires you grant the CREATE ON DATABASE privilege to the user as the postgres user. You use the following syntax: GRANT CREATE ON DATABASE videodb TO student; As the...
View ArticlePostgreSQL Write JSON File
In the process of working through issues to support ETL transformations from JSON with Python. The first step was extracting a the data from a PostgreSQL table into a JSON file. The syntax wasn’t...
View ArticlePostgreSQL Table Function
This shows how to write a PL/pgSQL function that returns a filtered table result set while writing to a debug log file. The example requires a small character table, like: DROP TABLE IF EXISTS...
View ArticleFedora 30 pgAdmin4 Install
Last September, the pgAdmin4 installation stymied me. I wasn’t sure what was I had done wrong in the installation but I was on a deadline to release my Fedora 30 Linux virtualization. That meant I had...
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