SQL topics to focus on 1. Group By ( aggregation) 2. Where vs having clause 3. Inner and outer joins 4. Union vs union all 5. Nulls , and how they affect your queries 6. Sub query, depends on your experience and their requirements 7. Case statements
Good luck OP. Please let us know how it goes and also what kinda questions they asked.
comments
1. Group By ( aggregation)
2. Where vs having clause
3. Inner and outer joins
4. Union vs union all
5. Nulls , and how they affect your queries
6. Sub query, depends on your experience and their requirements
7. Case statements
Good luck OP. Please let us know how it goes and also what kinda questions they asked.