Category: SQL

In SQL Server, you can use multiple WHERE conditions to filter the results of a SELECT query based on specific criteria. This allows you to retrieve data that meets multiple requirements simultaneously. To use multiple WHERE conditions in an SQL Server SELECT query, you can combine conditions using logical operators such as AND, OR, and…(Continue Reading)

SQL Server stored routines, also known as stored procedures, are a fundamental component in SQL Server used to encapsulate and manage SQL statements and control flow logic. These routines offer numerous benefits in terms of performance, security, and maintainability of database applications. Key Aspects of SQL Server Stored Routines 1. Definition and Creation Stored routines…(Continue Reading)

In SQL Server, the CAST function is used to convert an expression of one data type to another. This is particularly useful when you need to ensure that data is of the correct type for a specific operation or comparison. When you need to convert a value to an integer, you can use the CAST…(Continue Reading)

A foreign key is a field (or collection of fields) in one table that uniquely identifies a row of another table. The table containing the foreign key is known as the child table, and the table containing the candidate key is known as the parent table. The purpose of the foreign key is to ensure…(Continue Reading)

SQL (Structured Query Language) is a domain-specific language used for managing and manipulating relational databases. In SQL Server, a query is a statement or command that you use to interact with the database to retrieve, insert, update, or delete data. SQL queries are an integral part of working with SQL Server and are used for…(Continue Reading)

SQL constraints are rules enforced on data columns in SQL Server databases. They ensure the accuracy and reliability of the data in the database. By restricting the type of data that can be stored in a particular column, constraints prevent invalid data entry, which is crucial for maintaining the overall quality of the database. In…(Continue Reading)

In SQL, TINYINT is a data type used to store integer values, typically representing small whole numbers. It is a compact data type that takes up very little storage space compared to larger integer types like INT or BIGINT. The TINYINT data type is primarily used when you need to conserve storage space or when…(Continue Reading)

Autoincrement, also known as an identity column or auto-incrementing field, is a feature in SQL Server and many other relational database management systems (RDBMS) that simplifies the process of generating unique, sequential values for a column in a table. This feature is commonly used for primary keys, ensuring that each row in a table has…(Continue Reading)

In SQL, you can use the SELECT statement with the MAX() function to retrieve rows that have the maximum value in a specific column or set of columns. This is a common operation when you want to find the records with the highest or maximum values in a dataset. Let’s dive into how to write…(Continue Reading)

The SQL TOP clause used to limit the number of rows returned by a query. It is often used when you want to retrieve a specific number of rows from a table that meet certain criteria, or when you want to retrieve the first N rows of a result set. SQL TOP is supported by…(Continue Reading)