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73. What is Cross-Join? Cross join produces a result set which is the number of rows in the first table multiplied by a number of rows in the second table if no WHERE clause is used along with Cross join. This kind of result is known as Cartesian Product. If suppose, Where clause i...
There’s an old joke. A SQL query walks into a bar and sees two tables. He walks over and asks if he can join them…. The joke comes from the “if you didn’t laugh, you’d cry” school of programing. For some people the lesson using a SQL join example is the point when they...
In an interview, the interviewer can at any point ask you to pen down a code for a certain task on the whiteboard. The book that we are discussing here includes some amazing tips and methods mentioned that will help you comprehend the process, effortlessly. The questions that are asked duri...
questions from Python are discussed.Sample interview questions using SQL Join is explained with simple inner and outer joins as well as with tricky self-join examples.Questions using important analytical functions such as lead, lag, sum, max, min, group by, rollup, and cube are explained with ...
We must also ensure that a user is not compared to his own subscription. We also want to run a left join on itself to match a user with each other user that satisfies our condition. We will create two replicas s1 and s2 of the same table now. ...
Points: 17 More actions December 25, 2014 at 10:12 am #1766412 Nice list of questions. Thanks. Could someone provide an example from question 10 where "HAVING without GROUP BY" works. The SQL doc says you can do this and it behaves like a WHERE clause, but I've never ...
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SQL Self JOIN A self JOIN is a regular join, but the table is joined with itself. SQL CROSS JOIN The SQL CROSS JOIN produces a result set which is the number of rows in the first table multiplied by the number of rows in the second table if no WHERE clause is used along with CROSS...
The other fields can be a little more tricky depending on your environment. There are two patterns for populating CreatedBy as well as two patterns for populating UpdatedBy and UpdatedOn. Below you will find the pros and cons of each. Pattern One For CreatedBy The first pattern has the Cre...