What is compute?

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Mention what does plvtab enables you to do when you showthe contents of pl/sql tables?

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How does a covering index work?

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Does a join table need a primary key?

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how are mysql timestamps seen to a user? : Sql dba

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what is inline view?

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Why procedure is used in sql?

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How global cursor can be declare with dynamic trigger ?

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What is optimistic concurrency control? : Transact sql

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What is a join?Explain the different types of joins?

6 Answers   Bank Of India, CitiGroup, Google, ICICI, Saama Tech, SkyTech, TCS,

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What are the 3 types of behavioral triggers?

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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.

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