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Tag: SQL select

SQL select is used to retrieve records from a database, as a result, it returns the records requested.

how to write subqueries in SQL

Posted on April 5, 2021May 6, 2021 By admin No Comments on how to write subqueries in SQL

In SQL a lot of the times there will be a need to write subqueries that will extract data that you can analyse. But what if you want to use the data as input to another query that can then be used to give you the result you desire? This is is the power of…

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SQL

How to Group By in a Select Statement

Posted on April 5, 2021May 23, 2021 By admin No Comments on How to Group By in a Select Statement

SQL group by is one of the most commonly used statements you will come across and it has many different applications. It is a great way to aggregate data, when you are using one of the following in the select statement: (A) Sum (B)Count (C) Average (D) Max (E) Min There are more that can…

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SQL

How To Join Tables In SQL

Posted on February 20, 2021November 8, 2022 By admin No Comments on How To Join Tables In SQL

When running an sql select query, most likely we may have a need to bring in data from other tables. The reason for this is that tables have a specific purpose for the data they store. One of the most important features of a data architecture is to avoid duplication. This has the impact of…

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SQL, SQLite

How to use wildcards in SQL

Posted on February 4, 2021May 23, 2021 By admin No Comments on How to use wildcards in SQL

Following on from from our previous posts on SQL, this post will help to explain how to use wildcards in your query. What would you use a wild card in the first place? When a data analyst dealing with a large dataset, it is most likely that they will not know every piece of data….

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SQL, SQLite, strings

how to select columns with SQL

Posted on January 22, 2021February 7, 2021 By admin No Comments on how to select columns with SQL

Building on how to select all records with SQL , you may want to learn how to get specific columns of data from your table. Using SQLite again , we will now look to select two columns from the table below, namely name and iso_code. The purpose of completing this, is to allow the user…

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SQL, SQLite, Working with databases

how to select all records with SQL

Posted on January 21, 2021February 9, 2021 By admin No Comments on how to select all records with SQL

As part of working as a data analyst, in order to retrieve your data you will most likely need to connect into a database, and look at the database records and then start analysing, but how? At the start of any data analytics project you will need to understand the structure of your data and…

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SQL, SQLite, Working with databases

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