what is a relationship and what are they? : Sql dba

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What is crud diagram?

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how to check the 3rd max salary from an employee table? One of the queries used is as follows: select sal from emp a where 3=(select count(distinct(sal)) from emp b where a.sal<=b.sal). Here in the sub query "select count(distinct(sal)) from emp b where a.sal<=b.sal" or "select count(distinct(sal)) from emp b where a.sal=b.sal" should reveal the same number of rows is in't it? Can any one here please explain me how is this query working perfectly. However, there is another query to get the 3rd highest of salaries of employees that logic I can understand. Pls find the query below. "select min(salary) from emp where salary in(select distinct top 3 salary from emp order by salary desc)" Please explain me how "select sal from emp a where 3=(select count(distinct(sal)) from emp b where a.sal<=b.sal)" works source:http://www.allinterview.com/showanswers/33264.html. Thanks in advance Regards, Karthik.

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What is the difference between row level and statement level trigger?

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what are the 'mysql' command line options? : Sql dba

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What does “select count(*) from tab” result?

15 Answers   IBM, Student, Wipro,

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what are ddl statements in mysql? : Sql dba

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Explain what is a field in a database and record in a database?

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What does inner join mean?

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What is the usage of distinct keyword?

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What is substitution variable in pl sql?

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how to fetch alternate records from a table? : Sql dba

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