SQL

To sort data in SQL, we use the ORDER BY clause.

Constraint is the rule applied on the data columns of a table.

In SQL, the JOIN clause is used to combine records from two or more tables in a Database using common values ​​from each table.

INNER JOIN in SQL is the most important and often used JOIN type.

The LEFT JOIN in SQL is the type of JOIN that returns all records from the left table and matching records from the right table.

RIGHT JOIN in SQL is a type of JOIN that returns all records from the RIGHT side table and matching records from the LEFT side table.

FULL JOIN in SQL returns all records in the left table and the table must combine and fill in that NULL values ​​for values ​​do not match.

Each Join operation must have two tables, but there are cases where you have to perform JOIN on the same table, but you can call this JOIN operation SELF JOIN.

CARTESIAN JOIN in SQL returns the Cartesian product of record sets from two or more combined tables.

NULL in SQL is the term used to represent a missing value.

SQL ALIAS is used to create a temporary name (called an alias) for a column or table.

SQL index (INDEX) is a special lookup table that database search engines can use to quickly increase the time and performance of data retrieval.

The ALTER TABLE statement in SQL is used to add, delete, and modify columns in an existing table.

Adjusting SQL performance is a never-ending battle. This article will provide some tips for you to find slow SQL queries and perform performance tuning in SQL Server.

The code in SQL Operations Studio (preview) is the template that makes it easier to create databases and database objects.

Detailed utilities retrieve the Transact-SQL (T-SQL) queries you use to monitor servers and databases, then turn them into visual images.

UPDATE is the query used to edit existing records in the table. You can use the WHERE clause with the UPDATE statement to update selected rows, if not all rows in the table are

The AND and OR operators are used to combine multiple conditions to narrow the data in SQL statements. These two operators are called conjugate operators in SQL. AND and OR allow