A SQL query is different from a program in that it does not say HOW to do something, just WHAT THE RESULT IS. Set based logic. So you get a query analyzer in (depending on product bad …

Apr 14, 2011 · All standards-compliant SQL dialects work the same way. Note: To compare if your value is not null, you use IS NOT NULL, while to compare with not null value, you use <> …

The database engine does not have to run the subquery entirely. If a single record is matched, the EXISTS operator returns true, and the associated other query row is selected. The inner …

Nov 27, 2013 · Does the SqlBulkCopy create a data file? I would like to understand this stuff to work out whether I can use the bulk insert functionality in SQL. If I write a SQL statement that …

Given that indexing is so important as your data set increases in size, can someone explain how indexing works at a database-agnostic level? For information on queries to index a field, check …

Sep 1, 2013 · However, I have a problem to understand how does it work in case of non-numeric columns. My problems originates from this exercise (on sql-ex.ru) Find out makers who …

I have 4000 rows for example, and I define X limit. The query stops after it finds X rows? or the query finds all the rows and then takes X rows from the found rows? Thank you.

Jul 14, 2011 · I am trying to understand how does joins work internally. What will be the difference between the way in which the following two queries would run? For example (A) Select * …

Jul 21, 2015 · The Top shows actual no of rows to be 2, and so does the Table Scan; Which is not the case (there I many rows). But when I run something like SELECT TOP (2) * FROM …

The way parameterized queries work, is that the SQL query is sent as a query, and the database knows exactly what this query will do, and only then will it insert the username and passwords …