I’ve been usingPostgreSQLinstead ofMySQLfor a while now. When I first migrated, one problem I had was related to how string columns work.In PostgreSQL they’recase-sensitive. To demonstrate how PostgreSQL works let’s create a table with a unique index. -- create the tableCREATETABLEusers(...
Stored procedures in PostgreSQL are ones that define a function for creating triggers or custom functions. There are three main types of control structures available with PostgreSQL to use with stored procedures: IF, CASE, and LOOP. IF statements ...
You cannot return a string in result_1 and an integer in result_2 and so on. Let's dig into some examples now. Writing PostgreSQL CASEs Let's start simple. You will now write a CASE to group the countries with respect to the independence year. Independence years are recorded in the ...
4.1. Installing PostgreSQL Copy link RHEL 9 provides PostgreSQL 13 as the initial version of this Application Stream, which you can install easily as an RPM package. Additional PostgreSQL versions are provided as modules with a shorter life cycle...
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First, you need to enter the PostgreSQL server name. if it is on your localhost then press Enter. The default value mentioned in the square bracket e.g. [localhost] is the default server. Next, it will ask for the Database to connect to the server. Press Enter to connect with the de...
The next step is to create a user, so sign in to PostgreSQL: ShellCopy to clipboard sudo -u postgres psql -d template1 Then create a user (in our caserunner) which is used by your application. Change$passwordin the command below to a real strong password. ...
PostgreSQL 9.1 requires a custom variable class to be defined for those GUC parameters. Seecustom_variable_classesfor details. Installation This section describes the installation steps. building binary module Simplly run "make" in the top of the source tree, then "make install" as appropriate use...
PostgreSQLCopyHelper Custom Type Maps One can always define a custom map function for any property to anyNpgsqltype. For example: .Map("geo",x=>x.geo,NpgsqlDbType.Point) Mapping Composite Types Imagine you have a composite type calledperson_typein a schema of your database: ...