Question:- How to Delete a Trigger?
Answer:- To delete a trigger, you need to use the command DROP TRIGGER.
Question:- What are the Advantages of Stored Procedures?
Answer:- Stored procedures have various advantages to help you design sophisticated database systems. Some of the advantages of stored procedures as listed below: • Better performance • Higher productivity • Ease of use • Increased scalability • Interoperability • Advance security • Replication
Question:- What are the Various Types of Schema Objects that can be Created by PL/SQL?
Answer:- There are various types of schema objects that are created by PL/SQL. Some of them are mentioned below: • Stored procedures, packages, and functions • Object tables, object types, and object views • Database triggers • Database links • Cursors • Table • View
Question:- What is the Advantage of Implicit Records?
Answer:- Implicit records are handy since they do not require hard-coded descriptions. Because implicit records are based on database table records, any changes to the database table records will be reflected in the implicit records automatically.
Question:- What are the Ways of Commenting in PL/SQL?
Answer:- In PL/SQL, comments help readability by describing the purpose and function of code portions. Two types of comments are available in PL/SQL. They are as follows: • Single-line Comments: Single-line comments start with a double hyphen (- -) at the beginning of a line and go all the way to the conclusion. • Multi-line Comments: Multi-line comments start with a slash-asterisk (/*) and terminate with an asterisk-slash (*/), and they can span across several lines.
Question:- What is %TYPE?
Answer:- The %TYPE property is used to declare a column in a table that includes the value of that column. The variable’s data type is the same as the table’s column.
Question:- What is %ROWTYPE?
Answer:- The %ROWTYPE property is used to declare a variable that contains the structure of the records in a table. The variable’s data type is the same as the table’s columns.
Question:- Differentiate between a Temporary Tablespace and a Permanent Tablespace
Answer:- A temporary tablespace is used to store temporary items such as sort structures, while a permanent tablespace is used to store things that will be used as the database’s genuine objects.
Question:- How Many Triggers can be Applied to a Table?
Answer:- A maximum of 12 triggers can be added to a table.
Question:- What is a Mutating Table Error?
Answer:- A mutating table error occurs when a trigger tries to update a row that is currently in use. It can be fixed by using views or temporary tables so that the database selects one and updates the other.
Question:- What does the PLVtab Enable you to do when you Show the Contents of PL/SQL Tables?
Answer:- PLVtab enables you to do following when you show the contents of PL/SQL tables: • Display or suppress the row numbers for the table values • Show a prefix before each row of the table • Display or suppress a header for the table
Question:- How can you Save or Place your msg in a Table?
Answer:- To save a msg in a table, you either load the individual messages with calls to the add_text procedure or load sets of messages from a database table using the load_from_dbms procedure.
Question:- What are Pseudocolumns and how do they work? How can Pseudocolumns be used in Procedure Statements?
Answer:- Pseudocolumns aren’t genuine table columns but they behave like them. Pseudocolumns are used to retrieve specific information in SQL statements. Although pseudocolumns are recognized by PL/SQL as part of SQL statements, they cannot be used directly in a procedural language. The following are the pseudocolumns that are used: • CURRVAL and NEXTVAL • LEVEL • ROWID • ROWNUM
Question:- What is the use of the || Operator?
Answer:- The strings are concatenated using the || operator. The || operator is employed by both DBMS_OUTPUT.put line and select statements.