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  • What is Denormalization of data in a database? Working with databases
  • TypeError: type object is not subscriptable strings
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  • How To Join Tables In SQL SQL
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Tag: sql

Use SQL or structured query language to write code to create, read, update and delete data into a database table, which can then be retrieved at a later stage.

What is the difference between DROP and TRUNCATE in SQL?

Posted on February 27, 2023March 17, 2023 By admin

DROP and TRUNCATE are two SQL commands that can be used to remove data from a table, but they work in different ways: How to drop a table from a database It is important to remember that if you have the same name spread over a few databases, you should reference the correct databases, to…

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SQL, Working with databases

What is Query Optimization in SQL?

Posted on February 23, 2023March 12, 2023 By admin

Query optimization in SQL refers to the process of improving the performance of SQL queries by selecting the most efficient execution plan for the query. When a SQL query is executed, the database management system (DBMS) must determine the best way to retrieve the requested data from the database. Query optimization involves analyzing the query…

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SQL, Working with databases

What is a Clustered Index in SQL?

Posted on February 23, 2023March 12, 2023 By admin

In SQL, a clustered index is a type of index that determines the physical order of the data in a table. It organizes the table data based on the values in one or more columns, and stores the data in the table accordingly. When a clustered index is created on a table, the rows of…

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SQL, Working with databases

What is a Unique key in SQL?

Posted on February 23, 2023February 23, 2023 By admin

In SQL, a unique key is a constraint that ensures that the values in a column or set of columns are unique across all rows in a table and that the values cannot be null. A unique key is similar to a primary key, but it differs in that it does not necessarily need to…

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SQL, Working with databases

What Are Constraints in SQL?

Posted on February 23, 2023March 12, 2023 By admin

In SQL, constraints are rules that are enforced on a table’s data to maintain the integrity and accuracy of the data. Constraints can be applied to one or more columns in a table, and they can be added or removed as needed. Here are some of the most common types of constraints in SQL: Constraints…

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SQL, Working with databases

What is the difference between SQL and MySQL?

Posted on February 23, 2023March 12, 2023 By admin

SQL(Structured Query Language) and MySQL are related but distinct concepts. SQL is a programming language that is used to manage relational databases, while MySQL is a specific relational database management system (RDBMS) that uses SQL as its query language. Here are some key differences between SQL and MySQL: In summary, SQL is a language used…

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SQL, Working with databases

What is a CTE in SQL?

Posted on February 23, 2023March 12, 2023 By admin

CTE stands for Common Table Expression, and it is a temporary named result set that you can reference within a SQL statement. A CTE is defined within a query and is available only for the duration of that query. It allows you to create a named temporary table that you can reference multiple times within…

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SQL

What is Apache Spark and what is it used for?

Posted on February 12, 2023March 12, 2023 By admin

You have been probably looking at large sets of data for a while, and projects to extract insights from them. If you are given a set of data that is so large you may need something more! This is where Apache Spark comes in! So what does Apache Spark do? It performs the following functions:…

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Apache Spark, Python, SQL

how to update records in SQL

Posted on March 15, 2021May 23, 2021 By admin

There are multiple reasons for wanting to update records in a database table, from data quality to enriching your data for any machine learning projects. One example maybe where you want to add a creation date to a record. In this blog post we will look at how to update database records, and also where…

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CRUD, SQL

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