how to find the First and Last Observation from the table: Ex: OBS Name Sal Ans like: OBS Name Sal 105 E 5000--> 105 E 5000 102 B 2000 104 D 4000 103 C 3000 101 A 1000--> 104 D 4000

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What is row_number () in sql?

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What is the difference between left join and right join?

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if table named a is there and 4 records are there then how to swap (1 and 3) and (2 and 4) records at a time

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Is id a reserved word in sql?

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What is int identity in sql?

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Which is better varchar or nvarchar?

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what is “go” in t-sql? : Transact sql

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Do prepared statements prevent sql injection?

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discuss about myisam index statistics collection. : Sql dba

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Which language is used in sql?

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PL/SQL allocates memory for the variable's at runtime or at compile time

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