You have a table named pens. Management has asked you to delete all the records from the pens table.What statement should you enter? (Choose all that apply.1 pointTRUNCATE TABLE pens;DELETE pens;DELETE FROM pens;DELETE FROM pens WHERE pen_id IN (SELECT pen_id FROM pens);
Question
You have a table named pens. Management has asked you to delete all the records from the pens table.What statement should you enter? (Choose all that apply.1 pointTRUNCATE TABLE pens;DELETE pens;DELETE FROM pens;DELETE FROM pens WHERE pen_id IN (SELECT pen_id FROM pens);
Solution
The correct statements to delete all records from the 'pens' table are:
- TRUNCATE TABLE pens;
- DELETE FROM pens;
The 'TRUNCATE TABLE pens;' statement is a Data Definition Language (DDL) command that is used to mark the extents of a table for deallocation (empty for reuse). The result of this operation quickly removes all data from a table, typically bypassing a number of integrity enforcing mechanisms intended to protect data.
The 'DELETE FROM pens;' statement is a Data Manipulation Language (DML) command that is used to delete all the records from the 'pens' table. This command will delete each row one by one and write to the transaction log for each deleted row.
The 'DELETE pens;' statement is incorrect because the correct syntax of the DELETE statement in SQL should be 'DELETE FROM table_name'.
The 'DELETE FROM pens WHERE pen_id IN (SELECT pen_id FROM pens);' statement is also correct, but it's not efficient because it deletes the records one by one and also uses a subquery to select all pen_id from the pens table, which is unnecessary when you want to delete all records.
Similar Questions
Choose the correct options. __________ command is used to delete the records and _________ command is used to delete the db objects?Select one:Drop ,TruncateTruncate , DeleteTruncate , DropDelete , Truncate
To delete rows from the SALES table, where the PROMO_NAME column in thePROMOTIONS table has either 'blowout sale' or 'everyday low price' as values. Which DELETE statements are valid? (Choose all that apply.)Select one or more:a.DELETEFROM salesWHERE promo_id = (SELECT promo_idFROM promotionsWHERE promo_name = 'blowout sale')AND promo_id = (SELECT promo_idFROM promotionsWHERE promo_name = 'everyday low price');b.DELETEFROM salesWHERE promo_id IN (SELECT promo_idFROM promotionsWHERE promo_name = 'blowout sale'OR promo_name = 'everyday low price');c.DELETEFROM salesWHERE promo_id = (SELECT promo_idFROM promotionsWHERE promo_name = 'blowout sale')OR promo_id = (SELECT promo_idFROM promotionsWHERE promo_name = 'everyday low price');d.DELETEFROM salesWHERE promo_id IN (SELECT promo_idFROM promotionsWHERE promo_name IN ('blowout sale','everyday low price'));
Which SQL statement is used to delete all records from a table?OptionsDROPTRUNCATEDELETE ALLREMOVE
What happens if the DELETE command is used without a WHERE clause?AOnly the first row will be deletedBAll rows in the table will be deletedCNo rows to delete
Select the correct answerWhat is the purpose of the SQL SELECT statement?OptionsTo delete records from a tableTo update records in a tableTo retrieve data from one or more tablesTo create a new table
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