what is the difference between a web-garden and a web-farm? : Sql dba

0 Answers  

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Write a simple program on cursors

2 Answers   BirlaSoft,

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How you can copy a file to file content and file to pl/sql table in advance pl/sql?

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What is the difference between a database and a relational database?

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What is the execution plan in sql?

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What are sql procedures?

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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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Write the order of precedence for validation of a column in a table ?

2 Answers  

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How to download oracle sql developer?

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How to change the order of columns in Oracle SQL Plus ?

0 Answers   MCN Solutions,

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What is the differnce between view and materialized view

4 Answers   TCS,

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How is indexing done in search engines?

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