In SQL, the HAVING clause can be used to specify a search condition for a group or an aggregate.
The HAVING clause is typically used with the GROUP BY clause. In cases where it’s not, there is an implicit single, aggregated group.
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SQL SELECT for Beginners
The SELECT statement is almost without doubt, the most commonly used statement in SQL.
The SELECT statement is used for retrieving data from the database. You can specify which rows you want returned, and which columns.
SQL GROUP BY Clause for Beginners
In SQL, the GROUP BY clause can be used to divide the results of a query into groups of rows.
This is usually done in order to perform one or more aggregations on each group.
Continue readingSQL ORDER BY Clause for Beginners
The ORDER BY clause is commonly used in SQL to sort the results of a query.
It allows you to specify the order in which the results are returned.
You can specify whether the results are sorted in ascending order or descending order. You can also specify multiple columns for sorting.
Continue readingHow Implicit Transactions Work in SQL Server
There are four transaction modes in SQL Server. One of these is implicit mode.
In SQL Server, an implicit transaction is when a new transaction is implicitly started when the prior transaction completes, but each transaction is explicitly completed with a COMMIT or ROLLBACK statement.
This is not to be confused with autocommit mode, where the transaction is started and ended implicitly.
Continue readingSQL Transactions Tutorial
In SQL, transactions are used to maintain data integrity by ensuring that a sequence of SQL statements execute completely or not at all.
Transactions manage sequences of SQL statements that must be executed as a single unit of work, so that the database never contains the results of partial operations.
When a transaction makes multiple changes to the database, either all the changes succeed when the transaction is committed, or all the changes are undone when the transaction is rolled back.
Continue readingSQL Greater Than (>) Operator for Beginners
In SQL, the greater than operator (>) compares two expressions and returns TRUE if the left operand has a value higher than the right operand; otherwise, it returns FALSE.
SQL Greater Than or Equal To (>=) Operator for Beginners
In SQL, the greater than or equal to operator (>=) compares two expressions and returns TRUE if the left operand has a value greater than or equal to the right operand; otherwise, it returns FALSE.
SQL Less Than or Equal To (<=) Operator for Beginners
In SQL, the less than or equal to operator (<=) compares two expressions and returns TRUE if the left operand has a value lower than or equal to the right operand; otherwise, the result is FALSE.
You can use it to determine whether a value is less than or equal to another value.
Continue readingSQL Less Than (<) Operator for Beginners
In SQL, the less than operator (<) compares two expressions and returns TRUE if the left operand has a value lower than the right operand; otherwise, the result is FALSE.