Temp Table vs CTE vs Table Variable
in SQL, SQL Interview Question 2024, Table Variable


------------------------------------------------

--CTE VS Temp Table vs Table Variable
--Certainly, here's a concise comparison:

CTE (Common Table Expression):

Use for simplifying complex queries
and recursive operations.
Limited to the scope of a single query.
Exists only for the duration of the query.

Advantages: Improved readability,
can be referenced multiple times.

Temporary Tables (using #):

Use for storing and manipulating significant
amounts of data.
Persists beyond a single query until explicitly
dropped or the session ends.

Advantages: Supports indexing, usable across
multiple queries or sessions.

Table Variables:

Use for smaller datasets and lightweight,
transaction-scoped operations.

Limited to the scope of a single batch,
stored procedure, or function.

Exists until the end of the batch,
stored procedure, or function.

Advantages: Typically faster for small
to moderate data,
no need for explicit dropping.

свернуть