what is self join and how it works??

2 Answers   Infosys,

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What will be the output of this Query? select to_char(trunc(add_months(sysdate-3),mm),mm/dd/yyyy) from dual

6 Answers   Cap Gemini, TCS,

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What is procedure explain with example?

0 Answers  

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Do you understand the meaning of exception handling?

3 Answers  

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Is it possible to access the current value in a session before accessing next value?

1 Answers  

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What is the syntax to add a record to 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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What is scalar data type in pl sql?

0 Answers  

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How do u count no of rows in a table?

8 Answers   CTS,

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What is the maximum number of rows in sql table?

0 Answers  

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what is meant by databases

4 Answers  

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What does cursor do in sql?

0 Answers  

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