Docker Exec Syntax In order to execute commands on running containers, you have to execute “docker exec” and specify the container name (or ID) as…
View More Docker Exec vs Run
Author: Bulent Soylu
Tuples and Rows in Postgres
There’s a difference between the two: a single row might exist on-disk as more than one tuple at any time, with only one of them visible to any single…
View More Tuples and Rows in Postgres
Migration from Oracle to Postgres
Data Type Mapping PostgreSQL has rich set of data types. Some of the important Data type conversion between Oracle and PostgreSQL is as follow. Oracle…
View More Migration from Oracle to Postgres
WITH Queries (Common Table Expressions)
SELECT in a WITH Clause The subqueries, which are often referred to as Common Table Expressions or CTEs, can be thought of as defining temporary…
View More WITH Queries (Common Table Expressions)
How a single PostgreSQL config change improved slow query performance by 50x
At Amplitude, our goal is to provide easy-to-use interactive product analytics, so everyone can find answers to their product questions. In order to provide a…
View More How a single PostgreSQL config change improved slow query performance by 50x
Recursive Queries, CTE (Common Table Expression) or Self Join, Recursive Views
The CTEs are like temporary tables that exist only during the execution of the query. a simple example: Another example using a function Getting “manager tree” for…
View More Recursive Queries, CTE (Common Table Expression) or Self Join, Recursive Views
Display big numbers in SQLPLUS
NUMWIDTH setting which is by default 10 and hence you can display only 10 numbers without conversion but anything beyond that becomes exponential format. SHOW…
View More Display big numbers in SQLPLUS
set operators in Postgres
Postgres offers set operators that make it easy to query and filter the results of searches from your database. Set operators are used to join…
View More set operators in Postgres
Left [Outer] Join and Right [Outer] Join
LEFT OUTER JOIN / LEFT JOIN returns all the rows from the LEFT table and the corresponding matching rows from the right table. If right…
View More Left [Outer] Join and Right [Outer] Join
Oracle database Patch on windows platform
Apply Oracle Patch on windows platform NOTE:412160.1 – Updated DST Transitions and New Time Zones in Oracle RDBMS and OJVM Time Zone File Patches 1. Set…
View More Oracle database Patch on windows platform