SQL – Unique Indexes Table of content SQL Unique Indexes The SQL Unique Index ensures that no two rows in the indexed columns of a table have the same values (no duplicate values allowed). A unique index can be created on one or more columns of a table using the CREATE UNIQUE INDEX statement in […]
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SQL – Non-Clustered Index Table of content SQL Non-Clustered Indexes The SQL Non-Clustered index is similar to the Clustered index. When defined on a column, it creates a special table which contains the copy of indexed columns along with a pointer that refers to the location of the actual data in the table. However, unlike […]
SQL – Self Join Table of content Self Join, as its name suggests, is a type of join that combines the records of a table with itself. Suppose an organization, while organizing a Christmas party, is choosing a Secret Santa among its employees based on some colors. It is designed to be done by assigning […]