how will you find out the last three records in a table with n no of records and delete them

3 Answers  

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how to extract a unit value from a date and time? : Sql dba

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Why do we need cursor in pl sql?

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How will you make performance better for application including front end and back

2 Answers   Metric Stream,

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What is the first action to perform a query? Suppose I have four tables and five joins and my query is getting slow day by day.

4 Answers   Hexaware,

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in a package one procedure is wrong package shows valid or not

4 Answers  

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What is the least restrictive isolation level? : Transact sql

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Is postgresql a server?

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SELECT emp_num, years, SUM(salary) FROM sales UNION ALL SELECT emp_id, SUM(takehomepay) FROM marketing What error is present in the sample code above? 1. Queries being combined with the UNION ALL statement are not allowed to have SELECT lists with a different number of expressions. 2. You are not allowed to use aggregate functions within two queries joined by a UNION ALL statement. 3. The UNION ALL statement incorrectly combines the "years" result from the first query with the "SUM (takehomepay)" result from the second query. 4. Unless the UNION ALL statement is replaced with a UNION statement, the queries will return duplicates. 5. The "emp_id" column from the second query must be renamed (or aliased) as "emp_num" so that it corresponds to the column name from the first query. Otherwise, the queries will not execute.

3 Answers  

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What is a primary key called that is made up of more than one field?

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what are enums used for in mysql? : Sql dba

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What is pl sql code?

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