What are pl/sql cursors?

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What is a ddl command?

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How do you write an index?

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how will be date change into string

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what are enums used for in mysql? : Sql dba

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What is set serveroutput on?

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What is normalization sql?

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A table was given with 3 columns like Manager id,Manager Name and Employee name. Question was to create hierarchy.

2 Answers   TCS,

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Difference between truncate, delete and drop commands?

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What is rtm in testing?

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how to concatenate two character strings? : Sql dba

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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.

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