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Here are 20 SQL interview questions that companies actually ask—covering joins, subqueries, indexing, performance, and more.

Today's Topic: Pyspark window function with condition Thanks for taking the time to learn more. In this video I'll go through your ...

PostgreSQL optimize query performance that contains Window function with CTE Helpful? Please use the *Thanks* button above!

Task 3: Window functions — LAG and LEAD (PARTITION BY user_id, ORDER BY payment_date), previous/next payment and ...

Today's Topic: Fill in missing rows when aggregating over multiple fields in Postgres Thanks for taking the time to learn more.

SQL query for last 5 years average calculation for each datapoint? Helpful? Please use the *Thanks* button above! Or, thank me ...

Is it possible to run the rank function on top of a query in MYSQL Helpful? Please use the *Thanks* button above! Or, thank me via ...

SQL Server running balance with Partition by month Helpful? Please use the *Thanks* button above! Or, thank me via Patreon: ...

How to rank by referring to date and status in sql? Helpful? Please use the *Thanks* button above! Or, thank me via Patreon: ...

SQL Query with duplication key Helpful? Please use the *Thanks* button above! Or, thank me via Patreon: ...

Get rows where contact has 20 activities within a minute - SQL query Helpful? Please use the *Thanks* button above! Or, thank ...

How to use LAG function in oracle pl sql until non zero or last row is reached? Helpful? Please use the *Thanks* button above!

MULTIPLE COUNTS IN THE SAME QUERY Helpful? Please use the *Thanks* button above! Or, thank me via Patreon: ...

MySQL select counter of current position Helpful? Please use the *Thanks* button above! Or, thank me via Patreon: ...

Return dates on which a team member was called back in more than once Helpful? Please use the *Thanks* button above!

MySQL query to get items from 3 types Helpful? Please use the *Thanks* button above! Or, thank me via Patreon: ...

Value from Previous Row with a value, some previous rows don't have a value Helpful? Please use the *Thanks* button above!

How can I summarize in MySQL a table to obtain a 3 month revenue average based on several columns? Helpful? Please use the ...

How to Add one row to another? Helpful? Please use the *Thanks* button above! Or, thank me via Patreon: ...

Extract rows where a column has null values group by id Helpful? Please use the *Thanks* button above! Or, thank me via ...