What is a unique constraint?

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what are the properties and different types of sub-queries? : Sql dba

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How can we link a sql database to an existing android app?

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What is the best free sql database?

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If i can use sys.check_constraints to display my constraints from my database using sql server 2005, how can i display then if i am using sql server 2000????

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What is a behavioral trigger?

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What are dml commands?

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How we can create a table in pl/sql block. Insert records into it? Is it possible by some procedure or function? Please give example?

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If I have a table T with 4 rows & 2 columns A & B. A has values 1,2,3,4. and B has 10,20,30,40. Write an Update SQL query which can Swap the values of A & B for all records. (Do not use a sub-query)

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What does count (*) do in sql?

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what is the difference between rownum pseudo column and row_number() function? : Sql dba

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How many clustered indexes can you have?

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