Is sql database free?

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What are all the different types of indexes?

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What is an index in sql with example?

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How to read xml file in oracle pl sql?

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what will be the output: select 1 from emp union all select 2 from emp;

2 Answers   iNautix,

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How do you know if a relationship is 2nf?

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If you want a column to be part of the result set, after which SQL keyword does it belong? 1. SELECT 2. FROM 3. WHERE 4. GROUP BY 5. HAVING

10 Answers   HCL, TCS,

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a. Can you delete data from a View. b. If Yes, can you delete it if there are multiple tables c. If No, can you delete if there is single source table which is joining.

1 Answers   CGI,

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How do we accept inputs from user during runtime?

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Which one of the following join types will always create a Cartesian Product? 1. CROSS JOIN 2. LEFT OUTER JOIN 3. RIGHT OUTER JOIN 4. FULL OUTER JOIN 5. INNER JOIN

2 Answers  

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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 if we write return in procedure?

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