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Which of the following statements are true about string constants in PostgresQL These are character sequences bound within single quotes. These are character array sequences bound within double quotes @tag@rstring_constant>@tag@ is a valid example of string constants in PostgresSQL Stagsestring_constant>\$tagS is a valid example of string constants in PostgresSQL Question 14 Which of the following statements are true about Write-Ahead Logging It increases the database reliability. It has no effect on the database reliability. This feature logs the changes before any changes are done to the database: This feature logs the changes after any changes are done to the database. Which of the following statements are true? DELETE is and example of Data Control Database Language DELETE is a faster operation than TRUNCATE TRUNCATE locks the entire table TRUNCATE supports WHERE condition Question 16 What is the meaning of this Query? ALTER TABLE STUDENTS ADD(GRADES VARCHAR2(20)); Add a column GRADES in the table STUDENTS None of the above Add a column STUDENTS in the table GRADES Error Which of the following are optional in SQL queries? SELECT WHERE DISTINCT FROM