When working with SQL, you might need to filter grouped results after performing a COUNT() operation. The HAVING clause is essential for this task, as it allows filtering after grouping the data. ✅ SQL Query …

When working with databases, there are situations where you need to retrieve rows from one table that do not have corresponding values in another table. This can be achieved efficiently using either the NOT IN …

When working with a records table that contains a datetime column in MySQL, you might need to retrieve records from the last six months. This can be easily achieved using the DATE_SUB function. MySQL Query …

SQL | Compare timestamp with date only Timestamp holds Date and Time both with 19 characters. To filter table record with the only date parameter can be achieved by SQL DATE() function. Consider the Employee table …

SQL | Timestamp in where clause to select the date range Select date range from the timestamp column with where clause can be done by using the BETWEEN operator. BETWEEN Operator : The BETWEEN operator selects …

SQL | Foreign Key A foreign key is a key used to link two tables.    A Primary key of a table is used as a foreign key for the other table. The primary key …

SQL | View View in SQL is a kind of virtual table. It does not physical exists in our database but have rows and column as there we have in a real database table. we …

SQL | Difference between primary key and unique constraints There is only one primary key in a table. It creates the clustered index automatically and it cannot have NULL value whereas there can be multiple …

SQL | LIKE operator The LIKE operator of SQL is used for such kind of operations. It is used to fetch filtered data by searching for a particular pattern in where clause.   The Syntax for …

SQL | difference between BETWEEN and IN operator The BETWEEN operator selects all records between the given range whereas IN operator selects all matching records given with the WHERE clause.   BETWEEN operator The Between operator in …

SSH | Export and Import Large Database OR Table Using SSH can be a good practice to manage the files and databases on your account. It is most important to use in the following circumstance …

Mysql | Trigger The trigger can be defined as a database object just like a stored procedure. It is a set of actions that fires automatically when an event occurs in a database.   Triggers …

By using following query we can find out the nth largest salary from employees table. SELECT salary FROM `employees` ORDER BY salary DESC LIMIT 1 OFFSET n-1 In the above query n is replaced by …

SQL Update statement The UPDATE statement is used to update the records of an existing table in a database. We can update single as well as multiple columns using SQL update statement. The basic syntax …

MySQL |  Increase the speed of a MySQL select query For increasing the speed of a query we have to do a couple of things First of all instead of using select * from table1, use …