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Updated weekly · Last refresh Nov 2

Top 50 data migration Interview Questions

The most frequently asked data migration questions across all roles and companies, ranked by real interview frequency. Updated daily.

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SQL & Data ManipulationStart here. 28 questions · ~365 min

Implementing Type 2 SCDsMedium

Practice

Recently asked

Apply Type 2 SCD logic to preserve customer history while inserting changed and new warehouse dimension records.

slowly changing dimensionsdata migrationdata integrity

Deloitte

Capgemini

Accenture

Data into SnowflakeMedium

Practice

Recently asked

Summarize Snowflake ingestion activity by source system and load method.

data migrationdata ingestiondata validation

Snowflake

Snowflake Computing

SQL to Databricks MigrationMedium

Practice

Recently asked

Compare source and Databricks object counts to identify missing objects and row-count mismatches.

data migrationsqldata validationEEPAM India

EPAM Systems

Convert MySQL to NoSQLHard

Practice

Recently asked

Translate multi-table MySQL analytics logic into equivalent NoSQL document operations while preserving joins, aggregates, and rankings.

nosqlmysqldata migration

Barclays

Detect Changed Records in SQLMedium

Practice

Recently asked

Compare two table snapshots to return added, deleted, and modified records with null-safe value comparisons.

JoinsData Wranglingdata migration

PwC

Merge, Keys, and Large Data MigrationMedium

Practice

Recently asked

Explain MERGE behavior, primary vs foreign keys, and how to migrate large data safely.

data migrationsqldatabase design

Snowflake Computing

Union With Mismatched ColumnsMedium

Practice

Recently asked

Combine five-column and eight-column event tables into one compatible PostgreSQL result set.

null handlingData Manipulationsql queries

Kpi Partners

SCD 2 Query ValidationHard

Practice

Recently asked

Explain SCD Type 2 implementation and verify historical versions are correct.

data migrationsqldata validation

Infosys

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Behavioral & Leadership9 questions · ~117 min

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Pipelines8 questions · ~104 min

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Execution3 questions · ~39 min

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