What is foreign key sql?

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What are the uses of sysdate and user keywords?

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What is bulk collections?

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Types of cursor locks and explanation each of them ?

3 Answers   DELL, HP Finsoft,

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Compare SQL and PL/SQL.

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How to find last day of the month in sql query

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What are the steps for performance tuning.

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How do I partition a table in sql?

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What is a transaction?

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Can we join 3 tables in sql?

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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 does rownum mean in sql?

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