What are aggregate and scalar functions?

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What is row_number () in sql?

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How do I quit sql?

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What is schema in sql example?

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What is dynamic SQl and how you will create and execute dynamic sql?

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What is union and union all keyword in sql and what are their differences?

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how many ways to get the current time? : Sql dba

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Explain the methods used to protect source code of pl/sql.

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Write the alter statement to enable all the triggers on the t.students table.

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what is union, minus and interact commands? : 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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What is pl sql package?

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