A quick tutorial on summing grouped data in SQL. >>>
Monthly Archives: October 2024
Run SQL Query on CSV File Contents From the Command Line
Learn how to run SQL queries on CSV file contents from the command line. >>>
How to Remove the First N Characters of a Column in SQL
Learn how to use SQL functions such as SUBSTRING and RIGHT to remove the first few characters of a column in SQL. >>>
Calculating Running Totals in SQL
Learn several methods for calculating running totals in SQL >>>
How to Use SELECT with Multiple Subqueries to Same Table in SQL
Using multiple subqueries referencing the same table can make the overall query long and inefficient. Learn how to avoid this. >>>
How to Rename a Database in SQL
Learn how to change a database’s name. >>>
How to Handle SQL Column Names That Are SQL Keywords?
Learn how to use reserved words as column names in SQL. >>>
Understanding the Execution Order of SQL Statements
Explore the logical execution order of SQL statements, from FROM to TOP, and learn how this order affects the outcome of a query. >>>
Run SELECT Query Without Locking in MySQL
Learn about running SELECT queries without using locks. >>>
When to Use Equals (=) vs. LIKE in SQL Queries
Explore the differences between the Equals (=) and LIKE operators and understand how they differ between MySQL, MSSQL, and PostgreSQL. >>>