How do you know if a relationship is 2nf?

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What does count (*) do in sql?

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1 SELECT a.field1, b.field2, c.field3, d.field4 2 FROM atable a, atable b, ctable c, dtable d 3 ? 4 ORDER BY 1 What is the minimum number of joins that must be specified on line 3 in the sample code above to properly link the tables? Notice that the table "atable" is aliased twice: once as "a" and once as "b." 1. One join 2. Two joins 3. Three joins 4. Four joins 5. Five joins

6 Answers   Sonata,

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What is plpgsql language?

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how to get a list of all tables in a database? : Sql dba

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Are subqueries better than joins?

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The in operator may be used if you know the exact value you want to return for at least one of the columns.

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i need department wise top 2 employees salary.which logic i will use

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What are the uses of sysdate and user keywords?

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What is group by in sql?

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wirte a query to remove null? following table are col1 col2 col3 dinesh null null null suresh null null null prakesh i want the output like col1 col2 col3 dinesh suresh prkaesh

6 Answers   TCS,

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Is primary key clustered index?

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