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Which SQL statement is used to modify existing data in a database?
- a)SELECT
- b)UPDATE
- c)DELETE
- d)INSERT
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Which SQL statement is used to modify existing data in a database?a)SE...
The UPDATE statement is used to modify existing data in a database. It allows you to update specific columns or rows in a table based on specified conditions.
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Which SQL statement is used to modify existing data in a database?a)SE...
UPDATE Statement:
The UPDATE statement is used in SQL to modify existing data in a database. It allows you to change the values of one or more columns in a table. The UPDATE statement is often used to update records based on certain conditions or to update multiple records at once.
Syntax:
The basic syntax for the UPDATE statement is as follows:
-
-
-
-
Example:
Let's consider a table called "employees" with the following structure:
+----+-----------+--------+
| ID | Name | Salary |
+----+-----------+--------+
| 1 | John Doe | 5000 |
| 2 | Jane Smith| 6000 |
+----+-----------+--------+
Suppose we want to update the salary of employee "John Doe" to 5500. We can use the following UPDATE statement:
After executing this statement, the "employees" table will be updated as follows:
+----+-----------+--------+
| ID | Name | Salary |
+----+-----------+--------+
| 1 | John Doe | 5500 |
| 2 | Jane Smith| 6000 |
+----+-----------+--------+
The UPDATE statement is a powerful tool in SQL that allows you to modify existing data in a database. It provides flexibility in updating individual records or multiple records at once based on specified conditions.
The UPDATE statement is used in SQL to modify existing data in a database. It allows you to change the values of one or more columns in a table. The UPDATE statement is often used to update records based on certain conditions or to update multiple records at once.
Syntax:
The basic syntax for the UPDATE statement is as follows:
UPDATE table_name
SET column1 = value1, column2 = value2, ...
WHERE condition;-
table_name: Specifies the name of the table that you want to update.-
SET: Specifies the columns and their new values that you want to update.-
column1 = value1, column2 = value2, ...: Specifies the columns and their new values.-
WHERE condition: Optional parameter that specifies the conditions that must be met for the update to occur. If not specified, all rows in the table will be updated.Example:
Let's consider a table called "employees" with the following structure:
employees table:+----+-----------+--------+
| ID | Name | Salary |
+----+-----------+--------+
| 1 | John Doe | 5000 |
| 2 | Jane Smith| 6000 |
+----+-----------+--------+
Suppose we want to update the salary of employee "John Doe" to 5500. We can use the following UPDATE statement:
UPDATE employees
SET Salary = 5500
WHERE Name = 'John Doe';After executing this statement, the "employees" table will be updated as follows:
+----+-----------+--------+
| ID | Name | Salary |
+----+-----------+--------+
| 1 | John Doe | 5500 |
| 2 | Jane Smith| 6000 |
+----+-----------+--------+
The UPDATE statement is a powerful tool in SQL that allows you to modify existing data in a database. It provides flexibility in updating individual records or multiple records at once based on specified conditions.
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Which SQL statement is used to modify existing data in a database?a)SELECTb)UPDATEc)DELETEd)INSERTCorrect answer is option 'B'. Can you explain this answer?
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Which SQL statement is used to modify existing data in a database?a)SELECTb)UPDATEc)DELETEd)INSERTCorrect answer is option 'B'. Can you explain this answer? for Software Development 2025 is part of Software Development preparation. The Question and answers have been prepared according to the Software Development exam syllabus. Information about Which SQL statement is used to modify existing data in a database?a)SELECTb)UPDATEc)DELETEd)INSERTCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Software Development 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which SQL statement is used to modify existing data in a database?a)SELECTb)UPDATEc)DELETEd)INSERTCorrect answer is option 'B'. Can you explain this answer?.
Which SQL statement is used to modify existing data in a database?a)SELECTb)UPDATEc)DELETEd)INSERTCorrect answer is option 'B'. Can you explain this answer? for Software Development 2025 is part of Software Development preparation. The Question and answers have been prepared according to the Software Development exam syllabus. Information about Which SQL statement is used to modify existing data in a database?a)SELECTb)UPDATEc)DELETEd)INSERTCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Software Development 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which SQL statement is used to modify existing data in a database?a)SELECTb)UPDATEc)DELETEd)INSERTCorrect answer is option 'B'. Can you explain this answer?.
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