Introduction In SQL , sometimes it is needed to use Single Quote in Strings and it comes rather confusing for new users in managing that ordeal.In this article we will focus on how can we use single quote in strings. How to escape single quote (‘) ? In SQL, if you want to use single …
Introductiuon In SQL, Creating and inserting data is important but maintaining databases are also important. Sometimes user are not happy with the current name of the table and wants to rename them according to needs. CAUTION : Before committing to any change, user should double check that renaming the table will not make or break …
Introduction In SQL, the IDENTITY property is used to create an auto-incrementing column. This property is mostly useful for generating unique numeric values. They are typically used as primary keys. The IDENTITY property is commonly associated with integer data types. Different database systems may have variations in syntax for implementing this property, for example in …
FLOOR() Function: SQL FLOOR is used to return the largest integer less than or equal to the specified numeric expression. Syntax: EXAMPLE: The result is the numeric part with the same data type. CEILING() Function: SQL CIELING() is used to get the smallest integer greater than, or equal to, the specified numeric expression as return …
SQL date functions are important to learn if you want to do anything related to-Forecasting.Managing historical data.There are several types of SQL Date functions but we are going to learn basics first. The Three SQL functions we are going to learn in this lesson are – DATEPART() This function returns an integer representing the specified datepart of …
Primary Key A primary key in SQL (Structured Query Language) is a special field or column or combination of columns within a table that uniquely identifies each record (row) in that table. It is used to uniquely identify all the rows of the table. In a table with a primary key, no two rows have …
SQL UNION and UNION ALL are used to combine result sets of two or more SELECT statements. Syntax: When we use only UNION , duplicate values are removed.When we use UNION ALL, ALL values are present and duplicates are not removed. EXAMPLE: To give a demo of UNION, we are going to use table ‘PLAYERS_LOCATION’ …
In SQL, unique constraint keep in check that all values of a column or columns are unique. Unique constraints make sure no duplicate values are present in the database table. Syntax: Here are some characteristics of unique constraint- Primary key vs Unique Constraint Both Primary key and unique constraint are used in DBMS to ensure …
In SQL, NOT NULL constraints are used to ensure that column(s) do not accept NULL values. Sometimes it is important to ensure no NULL values are present in table. Syntax: Above code will make sure zero NULL values are present in columns i.e. first_name, last_name and email. Here are the uses of NOT NULL Constraint …
What are SQL joins? SQL GROUP BY is used to group rows with similar values for aggregate functions. Without GROUP BY user cannot use aggregate functions. Syntax: Now lets use GROUP BY with HAVING Thanks For Reading! SOURCE : https://learn.microsoft.com/en-us/sql/t-sql/queries/select-group-by-transact-sql?view=sql-server-ver16 READ MORE:SQL BASICSSQL WINDOW FUNCTIONSSQL ORDER BY
