Working With NULL Values in SQL. The NULL value is a data type that represents an unknown value. We consider how NULL is used in creating tables, querying, string operations, and functions.
The NULL value is a data type that represents an unknown value. It is not equivalent to an empty string or zero. Suppose you have an employee table containing columns such as
ContactNumber and an alternate contact number. This table has a few mandatory value columns like
ContactNumber. However, an alternate contact number is not required and therefore has an unknown value. Therefore a NULL value in this table represents missing or inadequate information. Here are other meanings NULL can have:
In this post, we will consider how NULL is used in creating tables, querying, string operations, and functions.
SQL stands for Structured Query Language. SQL is a scripting language expected to store, control, and inquiry information put away in social databases. The main manifestation of SQL showed up in 1974, when a gathering in IBM built up the principal model of a social database. The primary business social database was discharged by Relational Software later turning out to be Oracle.
Overview on AlaSQL, the popular lightweight client-side in memory SQL database, including a real life example of AlaSQL in action. I was surprised to see that there aren’t more posts about this popular lightweight client-side in-memory SQL database online apart from this awesome article I found.
Introduction In this article, We will discuss how to backup our database in MS-SQL Server using T-SQL Statements. We need to use BACKUP DATABASE statement to create full database backup, along with…
Learn how to Create a Database in SQL Server Using SQL Server Management Studio (SSMS). This article briefly explains creating a new database with the New Database wizard of SQL Server Management Studio (SSMS).
Debug SQL stored procedures and develop your SQL database project with dbForge SQL Complete, a new add-in for Visual Studio and SSMS. When you develop large chunks of T-SQL code with the help of the SQL Server Management Studio tool, it is essential to test the “Live” behavior of your code by making sure that each small piece of code works fine and being able to allocate any error message that may cause a failure within that code.