Work through twenty practice queries on one small sales schema, with expected results for filters, joins, totals, windows, and gaps.
How to Join Two Tables Without Using Join Keywords? – Interview Question of the Week #266
Question: How to Join Two Tables Without Using Join Keywords?
Answer: In my life, I have attended many interviews as an interviewer.
The VALUES Table Constructor: Using a List as a Table
Use a VALUES table constructor for inline mappings and joins, understand the INSERT row limit, and move larger reusable lists into tables.
Query Plan Join: Why a Query With No Join Shows One
A query plan join can appear even when the query has no join, because SQL Server joins a nonclustered index to the table itself. This post reads the plan of a one table query, removes the join with a covering index, and finds the row count where SQL Server stops using lookups.
How to Write INNER JOIN Which is Actually CROSS JOIN? – Interview Question of the Week #250
Question: How to Write INNER JOIN Which is Actually CROSS JOIN?
Experienced this question another day while working with a client.
How to Use Multiple Hints Together for a Query? – Interview Question of the Week #241
Question: How to Use Multiple Hints Together for a Query?
Answer: Of course, you can use multiple hints for a query. Here is an example of the same.
Many-to-Many Merge Join and the Worktable in STATISTICS IO
Diagnose a many-to-many merge join and its worktable, verify true uniqueness, and compare join choices without changing legitimate matches.