COMPUTER SCIENCE AND ENGINEERING
SQL
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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update only one row at a time
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update more than one row at a time
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delete more than one row at a time
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delete only one row at a time
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Detailed explanation-1: -Explanation: The SQL UPDATE Query is used to modify the existing records in a table. You can use WHERE clause with UPDATE query to update selected rows otherwise all the rows would be affected. Explanation: The SQL UNION operator is used to combine the result sets of 2 or more SELECT statements.
Detailed explanation-2: -We can update the multiple rows of the table using the single update command. Let’s understand how to update the multiple rows of the table.
Detailed explanation-3: -The UPDATE command in SQL is used to modify or change the existing records in a table. If we want to update a particular value, we use the WHERE clause along with the UPDATE clause. If you do not use the WHERE clause, all the rows will be affected.
Detailed explanation-4: -There are a couple of ways to do it. INSERT INTO students (id, score1, score2) VALUES (1, 5, 8), (2, 10, 8), (3, 8, 3), (4, 10, 7) ON DUPLICATE KEY UPDATE score1 = VALUES(score1), score2 = VALUES(score2);
Detailed explanation-5: -You can use the UPDATE TOP (1) syntax to update just one row. However, there is no guarantee which row you’ll end up updating. If you need to update a specific row, then your where clause should outline exactly what row is to be updated.