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T-SQL interview questions

T-SQL interview questions.

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1.

Is it possible to rename a database? If so, how would you rename the database?

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2.

Mention what is TOP in TSQL?

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3.

What is TSQL Window functions?

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4.

Explain what are the differences between SQL and T-SQL?

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5.

What are the new error handling commands introduced with SQL Server 2005 and beyond?

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6.

Could you explain the difference between Primary Key and Unique Index?

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7.

Name 5 commands that can be used to manipulate text in T-SQL code

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8.

When should I use primary key or index?

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9.

Mention what are the limitations of IDENTITY column?

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10.

What are the three ways that Dynamic SQL can be issued?

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11.

What are the two commands to remove all of the data from a table? Are there any implications with the specific commands?

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12.

Mention what is subquery?

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13.

Mention what is OFFSET-FETCH filter in tsql?

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14.

How can you delete duplicate records in a table with no primary key?

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15.

Mention what are the Join Types in TSQL?

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16.

What are types of XML indexes in SQL Server?

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17.

Is there a difference between T-SQL linked server and a synonym?

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18.

What are the practical differences between COALESCE() and ISNULL(,'')?

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19.

Mention what does the T-SQL command IDENT_CURRENT does?

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20.

Mention what is uncommittable transactions?

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21.

In what version of SQL Server were synonyms released, what do synonyms do and when could you make the case for using them?

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22.

What two commands were released in SQL Server 2005 related to comparing data sets from two or more separate SELECT statements?

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23.

What's the difference between TRUNCATE and DELETE in SQL?

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24.

Mention what are ROLLUP and CUBE in T-SQL?

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25.

What are bitwise operators and what is the value from a database design perspective?

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26.

How can you capture the length of a column when it is a Text, NText and/or Image data type?

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27.

Provide an example of Left Outer Join with Exclusions

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28.

What is the use of GO in Transact SQL?

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29.

What is the difference between EXEC vs sp_executesql?

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30.

Is it possible to import data directly from T-SQL commands without using SQL Server Integration Services? If so, what are the commands?

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31.

What do Clustered and Non clustered index actually mean?

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32.

What is the difference between PARTITION BY and GROUP BY

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33.

What is the native system stored procedure to issue a command against all databases?

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34.

Is it correct/best practice to have the TRY/CATCH block inside the transaction or should the transaction be inside the TRY block?

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35.

What are the best practices for using a GUID as a primary key, specifically regarding performance?

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36.

From a T-SQL perspective, how would you prevent T-SQL code from running on a production SQL Server?

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