Question 21 : The SQL WHERE clause:
1. limits the row data are returned.
2. limits the column data that are returned.
3. Both A and B are correct.
4. Neither A nor B are correct.
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Question 22 : The command to remove rows from a table 'CUSTOMER' is:
1. DROP FROM CUSTOMER ...
2. UPDATE FROM CUSTOMER ...
3. REMOVE FROM CUSTOMER ...
4. DELETE FROM CUSTOMER WHERE ...
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Question 23 : What SQL command can be used to add columns to a table?
1. ALTER TABLE TableName ADD ColumnName
2. ALTER TABLE TableName ADD COLUMN ColumnName
3. MODIFY TABLE TableName ADD ColumnName
4. MODIFY TABLE TableName ADD COLUMN ColumnName
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Question 24 : What SQL command can be used to delete columns from a table?
1. MODIFY TABLE TableName DROP ColumnName
2. MODIFY TABLE TableName DROP COLUMN ColumnName
3. ALTER TABLE TableName DROP ColumnName
4. ALTER TABLE TableName DROP COLUMN ColumnName
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Question 25 : The SQL ALTER statement can be used to:
1. change the table data.
2. change the table structure.
3. delete rows from the table.
4. add rows to the table.
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Question 26 : When using the SQL INSERT statement:
1. rows cannot be copied in mass from one table to another only.
2. rows can be modified according to criteria only.
3. rows can either be inserted into a table one at a time or in groups.
4. rows can be inserted into a table only one at a time only.
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Question 27 : What is an SQL virtual table that is constructed from other tables?
1. view
2. A relation
3. Just another table
4. Query results
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Question 28 : Which of the following is NOT a type of SQL constraint?
1. PRIMARY KEY
2. ALTERNATE KEY
3. FOREIGN KEY
4. UNIQUE
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Question 29 : Which of the following join is also called as an 'inner-join'?
1. Non-Equijoin
2. Self-Join
3. Equijoin
4. None of these
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Question 30 : Which of the following SQL commands can be used to add data to a database table?
1. ADD
2. UPDATE
3. APPEND
4. INSERT
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