How to create a menu in sqlplus or pl/sql?

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What is the difference between truncate and drop statements?

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How can we make an if statement within a select statement?

0 Answers  

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what is self join and how it works??

2 Answers   Infosys,

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HOW CAN I FIND MAX SAL ,ENAME FROM EMP TABLE.

16 Answers  

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

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Can we create foreign key without primary key?

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What is the difference between UNIQUE KEY and UNIQUE INDEX?

3 Answers   TCS,

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how to run 'mysql' commands from a batch file? : Sql dba

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what is timestamp in mysql? : Sql dba

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What is sap sql anywhere?

0 Answers  

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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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