MS SQL SERVER: Advanced Query Concepts Copy
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Nested queries allow queries to be nested within other queries to derive more complex results. The ANY and IN operators can be used to compare a value to multiple results from a subquery. HAVING allows using aggregate functions in a having clause when grouping data, which is not possible in a where clause. Advanced query concepts also include nested select queries, usefulness of the HAVING clause, and operators like ANY and IN.
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ETL is the process of extracting data from various sources, transforming it to fit operational needs, and loading it into a data warehouse or database. It involves extracting data from sources like DVDs, books, and friends, transforming it by cleaning and consolidating the data, and loading it into a data warehouse for storage and analysis. Migrating a database transfers data from one platform or format to another, such as moving from a Foxpro database to SQL Server. New data is inserted into databases using INSERT statements specifying the table and values, ensuring data types match. Updates are made using UPDATE statements specifying the table, set value, and WHERE condition to identify the record to change.
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MS SQL SERVER: Advanced Query Concepts Copy
- 1. 11 SQL SERVER: ADVANCEDQUERY CONCEPTS
- 3. Any
- 4. In
- 6. Nested Select Queries Consider the following tables of the Fisherman database: Fisherman FishCatch Table: Now, I wish to find the names of the fishermen who caught a bass (any type). The SQL query would be: select name from fisherman where fishermanid = any(selectfishermanID from FishCatch where fish like â%Bass%â) As you can see, any is used to compare a particular recordâs field to that of multiple records.
- 7. Nested Select Queries The previous query can be rewritten using in as follows: Using ANY: select name from fisherman where fishermanid= any(selectfishermanID from FishCatch where fish like â%Bass%â) Using IN: select name from fisherman where fishermanidin(selectfishermanID from FishCatch where fish like â%Bass%â) NOTE: When using in remember NOT TO PUT THE â=â (Equal to ) operator
- 8. Usefulness of having âHavingâ We have seen that there exists a restriction that the aggregate functions cannot be used in the right side of where clause. This syntactical restriction may lead to several inconveniences while programming. To understand this, see the following problem: Find the Fisherman who has caught 2 fishes: We might think of this solution: Select FishermanID from fishTable where count(fish) =2 But this doesnât work as aggregate functions are not allowed on the right-side of where clause. So, how do we solve the problem? âHavingâ is our answer.
- 9. Having Find the Fisherman who has caught 2 fishes: Solving with having: Select fishermanID from fishtable group by fishermanidhaving count(fish)=2
- 11. In
- 12. Any