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23 results

Traidev Official
Crack Your SQL Interview: 20 Basic to Advance SQL Interview Questions Helps in Data Analyst 2026

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

1:04:22
Crack Your SQL Interview: 20 Basic to Advance SQL Interview Questions Helps in Data Analyst 2026

3,613 views

4 weeks ago

The Debug Zone
Pyspark window function with condition

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

2:06
Pyspark window function with condition

1 view

4 weeks ago

Roel Van de Paar
PostgreSQL optimize query performance that contains Window function with CTE

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

2:45
PostgreSQL optimize query performance that contains Window function with CTE

7 views

2 weeks ago

Surfalytics | Fast Track to Data Career
Mock Interview | SQL technical round | Episode 11 | Surfalytics

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

49:11
Mock Interview | SQL technical round | Episode 11 | Surfalytics

183 views

3 weeks ago

The Debug Zone
Fill in missing rows when aggregating over multiple fields in Postgres

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

1:48
Fill in missing rows when aggregating over multiple fields in Postgres

0 views

4 weeks ago

Roel Van de Paar
SQL query for last 5 years average calculation for each datapoint?

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

3:03
SQL query for last 5 years average calculation for each datapoint?

30 views

2 weeks ago

Roel Van de Paar
Is it possible to run the rank function on top of a query in MYSQL

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 ...

1:23
Is it possible to run the rank function on top of a query in MYSQL

14 views

11 days ago

Roel Van de Paar
SQL Server running balance with Partition by month

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

2:10
SQL Server running balance with Partition by month

2 views

3 days ago

Roel Van de Paar
How to rank by referring to date and status in sql?

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

2:10
How to rank by referring to date and status in sql?

3 views

7 days ago

Roel Van de Paar
SQL Query with duplication key

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

1:58
SQL Query with duplication key

4 views

6 days ago

Roel Van de Paar
Get rows where contact has 20 activities within a minute - SQL query

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

2:46
Get rows where contact has 20 activities within a minute - SQL query

8 views

8 days ago

Roel Van de Paar
How to use LAG function in oracle pl sql until non zero or last row is reached? (2 Solutions!!)

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

2:28
How to use LAG function in oracle pl sql until non zero or last row is reached? (2 Solutions!!)

3 views

1 day ago

Roel Van de Paar
MULTIPLE COUNTS IN THE SAME QUERY

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

1:52
MULTIPLE COUNTS IN THE SAME QUERY

10 views

12 days ago

Roel Van de Paar
MySQL select counter of current position

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

1:58
MySQL select counter of current position

7 views

5 days ago

Roel Van de Paar
Return dates on which a team member was called back in more than once

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

2:33
Return dates on which a team member was called back in more than once

15 views

13 days ago

Roel Van de Paar
MySQL query to get items from 3 types

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

1:46
MySQL query to get items from 3 types

5 views

6 days ago

Roel Van de Paar
Value from Previous Row with a value, some previous rows don't have a value

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

2:03
Value from Previous Row with a value, some previous rows don't have a value

5 views

7 days ago

Roel Van de Paar
How can I summarize in MySQL a table to obtain a 3 month revenue average based on several columns?

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

1:47
How can I summarize in MySQL a table to obtain a 3 month revenue average based on several columns?

4 views

7 days ago

Roel Van de Paar
How to Add one row to another?

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

2:39
How to Add one row to another?

13 views

11 days ago

Roel Van de Paar
Extract rows where a column has null values group by id

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

2:00
Extract rows where a column has null values group by id

46 views

11 days ago