Tag: databases

Questions Related to databases

For which of the following queries may a merge join be considered?
technology databases

  1. Outer joins

  2. Multi-table updates and deletes

  3. Equi-joins

  4. Equi-join with a text column in select list

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Correct Option: C

A UNION of two or more queries is valid provided the queries meet which of the following conditions? (Choose 3)
technology databases

  1. All select lists in the UNION must have the same number of expressions

  2. Corresponding columns must have the same column names

  3. Corresponding columns must be of the same datatype or the server must be able to implicitly convert them

  4. Corresponding columns must be in the same order

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Correct Option: A,C,D

Choose the correct statements about the union clause in ASE (Choose 2)

technology databases

  1. Duplicate rows are removed from the result set by default

  2. ASE evaluates a statement containing union operators from left to right

  3. Order by and group by clauses are not allowed in a union query

  4. The into clause can be used only in the first query

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Correct Option: A,B,D

Which of the following are true about triggers? (Choose 2)

technology databases

  1. the inserted and deleted tables are created manually

  2. triggers can be disabled using alter table

  3. a single trigger can be created for both insert and delete

  4. @@sqlstatus contains the number of rows affected

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Correct Option: B,C

Table t and trigger trig are created as follows: create table t (a int) go create trigger trig on t for insert, update, delete as begin if @@rowcount > 1 rollback trigger end go The following transaction is now executed: begin tran insert t values (1) insert t values (2) insert t select * from t insert t values (3) commit go After completing this transaction, how many rows will table t contain?

technology databases

  1. 0

  2. 1

  3. 2

  4. 3

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Correct Option: D

Which T-SQL elements can be used in a stored procedure? (Choose 2)
technology databases

  1. 'return', without a return value

  2. 'rollback transaction'

  3. 'rollback trigger'

  4. the built-in function 'update()'

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Correct Option: A,B

Which ASE table contains the source code of a stored procedure?
technology databases

  1. sysprocedures

  2. syscomments

  3. syslogs

  4. systext

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Correct Option: B

What is the maximum number of characters that can be passed to a stored procedure through a single char or varchar parameter without being truncated?

technology databases

  1. 127

  2. 255

  3. 16384

  4. equal to the server page size

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Correct Option: C

The following trigger exists: create trigger trig on t for insert, update, delete as begin print 'This is 'trig' ' end The following command is now executed: create trigger trig on t for insert as begin print 'This is 'trig' ' end After executing this command, for which DML actions on table 't' will a trigger be fired?

technology databases

  1. insert

  2. update

  3. insert, update, delete

  4. delete,update

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Correct Option: A

Creation of which DB objects will cause a DDL trigger to fire?
technology databases

  1. Index

  2. Cluster

  3. Package

  4. DB links

  5. Function

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Correct Option: A,C,E