Types of locks in database ?

8 Answers   HCL, TCS, Tieto,

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How you improve the performance of sql*loader? : aql loader

0 Answers  

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Explain two easy sql optimizations.

0 Answers  

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what is the difference between rownum pseudo column and row_number() function? : Sql dba

0 Answers  

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What is pseudo column ?

6 Answers   ABB,

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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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How many scalar data types are supported in pl/sql?

0 Answers  

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What is pl sql script?

0 Answers  

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what is External tables? explain with examples

2 Answers   TCS,

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What is the basic difference between a sql and stored procedure ?

2 Answers   L&T,

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What are the 3 modes of parameter?

0 Answers  

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i have a word ***********hello********world******. I require a o/p **********hello world**********, Need to delete the middle stars.

3 Answers  

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