Interested to Buy Any Domain ? << Click Here >> for more details...
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
- 9589 Views
- I also Faced
- E-Mail Answers
Answer Posted / roopesh kumar
1. Queries being combined with the UNION ALL statement are
not allowed to have SELECT lists with a different number of
expressions.
Reason
Number of columns diff in both query.
| Is This Answer Correct ? | 7 Yes | 1 No |
Post New Answer View All Answers
Can we join 3 tables in sql?
Can I call a procedure inside a function?
What is a composite primary key?
what are the advantages and disadvantages of views in a database? : Sql dba
What is the difference between delete and truncate statement in sql?
Is it possible to link two groups inside a cross products after the cross products group has been created?
what is the difference between truncate and drop statements? : Sql dba
What is difference between function and trigger?
What are the types of keys?
What is set transaction?
Is stored procedure faster than query?
What is a sql statement?
How do I find sql profiler?
how many sql dml commands are supported by 'mysql'? : Sql dba
How can we optimize a sql query?
