How do I find duplicates in a single column in sql?


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What is primary key secondary key alternate key candidate key?

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What is data type in database?

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When we can declare a column as Unique and Not Null both at the same time. What is the use pf Primary Key then?

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How many types of keys are there in sql?

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How is use pl and sql?

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How do I order columns in sql?

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How can use stored procedures in sql?

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a table has 2 classifications 1)liabilities 2)earnings this liabitity has 2 elements with 2 input values and the earnings have 2 elements with 2 input values i wrote a query so that my input is liability savings amount1 amount2 xxxx null xxxxxx 0 xxx1 null xxxxx1 0 null yyyy 0 yyyy null yyy1 0 yyy1 my problem is --when i developed a report(d2k) with this data my o/p is liabilities,amount1,savings,amount2 xxxx xxxxxx xxx1 xxxxx1 yyyy yyyy yyy1 yyy1 how could i move this savings,savings values 2 palces up. can any body provide me witha better solution

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What is indexes?

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How do I debug a stored procedure?

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