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Sonata SQL PLSQL Interview Questions

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What is the main difference between a UNION statement and a UNION ALL statement? 1. A UNION statement eliminates duplicate rows; a UNION ALL statement includes duplicate rows. 2. A UNION statement can be used to combine any number of queries; a UNION ALL statement can be used to combine a maximum of two queries. 3. A UNION statement can only combine queries that have parallel fields in the SELECT list; a UNION ALL statement can combine queries with differing SELECT list structures. 4. A UNION statement cannot be used with aggregate functions; a UNION ALL statement can be used with aggregate functions. 5. There is no difference between the two statements; they are interchangeable.

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1 SELECT a.field1, b.field2, c.field3, d.field4 2 FROM atable a, atable b, ctable c, dtable d 3 ? 4 ORDER BY 1 What is the minimum number of joins that must be specified on line 3 in the sample code above to properly link the tables? Notice that the table "atable" is aliased twice: once as "a" and once as "b." 1. One join 2. Two joins 3. Three joins 4. Four joins 5. Five joins

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SELECT flavor, SUM (ice_cream_sales) FROM sales_detail GROUP BY flavor ORDER BY 2 DESC If the "sales_detail" table contains ten records with different values in the flavor column (two "vanilla," three "chocolate," four "strawberry," and one NULL), how many rows are returned by the sample code above? 1. 0 rows 2. 1 row 3. 3 rows 4. 4 rows 5. 10 rows

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Which one of the following is a reason that an INSERT statement might cause an error instead of executing correctly? 1. The INSERT statement was attempting to insert a record into a view that was created from more than one table. 2. The INSERT statement was attempting to insert a record using a combination of constants and values from an existing table. 3. The INSERT statement was attempting to insert a record with a non-NULL value into a table that has that column defined as NULL. 4. The INSERT statement was attempting to insert a record into a table by selecting a record from that same table. 5. The INSERT statement was attempting to insert a record into a view rather than a table.

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How to retrieve a second highest salary from a table? Note:Suppose salaries are in duplicate values eg: Name Sal Malli 60000 Pandi 60000 Rudra 45000 Ravi 45000

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Sonata SQL PLSQL Interview Questions

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Un-Answered Questions

Are multiple data types stored in System.Array?

1187

What is the main goal of react fiber?

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How do you remove merge cells in excel?

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What is an interface in typescript?

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What is the job entry system used in your project? based on what criteria the sequence of jobs are picked if priority is not mentioned in the job card?

2289

What is a heal tool?

What are the challenges in applying AI to environmental issues?

What are the 2 other types of views, which are not allowed in release 3.0?

1121

Does nodejs use threads?

541

Do we need to pay the struts if being used in commercial purpose?

1004

What is the importance of production engineering in optimizing manufacturing processes and ensuring efficient production?

What is speech coding in gsm technology?

1108

Identify problem faced when mass spectroscopy is used with HPLC system ?

1862

What is lambda expression in java?

1044

When to use inner join and left join?

959