Can we use join in subquery?

0 Answers  

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What are the triggers associated with image items?

0 Answers  

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What is structural independence and why is it important?

0 Answers  

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What are code pages ?

1 Answers   BirlaSoft,

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What is meant by Join? What are the different types of Joins available? Explain.

5 Answers   Cap Gemini,

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What are user defined stored procedures ?

3 Answers   BirlaSoft,

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what happens if null values are involved in expressions? : Sql dba

0 Answers  

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while loading data into database how can u skip header and footer records in sql*loader

1 Answers   Oracle,

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How do you remove duplicate records from a table?

0 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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When is the update_statistics command used?

0 Answers  

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What is pl/sql table? Why is it used?

0 Answers  

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