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Consider the following SQL table definition:
CREATE TABLE Customers (
CustomerID INT PRIMARY KEY,
CustomerName VARCHAR(50) NOT NULL,
Email VARCHAR(50) UNIQUE
);
Which of the following SQL statements drops the unique constraint on the "Email" column?
  • a)
    ALTER TABLE Customers DROP CONSTRAINT UNIQUE Email;
  • b)
    ALTER TABLE Customers DROP UNIQUE Email;
  • c)
    ALTER TABLE Customers DROP CONSTRAINT UQ_Customers_Email;
  • d)
    ALTER TABLE Customers DROP UQ_Customers_Email;Output: No output.
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
Consider the following SQL table definition:CREATE TABLE Customers (Cu...
The ALTER TABLE statement is used to modify an existing table. To drop the unique constraint on the "Email" column, the correct syntax is to use the DROP CONSTRAINT keyword followed by the constraint name (e.g., UQ_Customers_Email).
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Consider the following SQL table definition:CREATE TABLE Customers (CustomerID INT PRIMARY KEY,CustomerName VARCHAR(50) NOT NULL,Email VARCHAR(50) UNIQUE);Which of the following SQL statements drops the unique constraint on the "Email" column?a)ALTER TABLE Customers DROP CONSTRAINT UNIQUE Email;b)ALTER TABLE Customers DROP UNIQUE Email;c)ALTER TABLE Customers DROP CONSTRAINT UQ_Customers_Email;d)ALTER TABLE Customers DROP UQ_Customers_Email;Output: No output.Correct answer is option 'C'. Can you explain this answer?
Question Description
Consider the following SQL table definition:CREATE TABLE Customers (CustomerID INT PRIMARY KEY,CustomerName VARCHAR(50) NOT NULL,Email VARCHAR(50) UNIQUE);Which of the following SQL statements drops the unique constraint on the "Email" column?a)ALTER TABLE Customers DROP CONSTRAINT UNIQUE Email;b)ALTER TABLE Customers DROP UNIQUE Email;c)ALTER TABLE Customers DROP CONSTRAINT UQ_Customers_Email;d)ALTER TABLE Customers DROP UQ_Customers_Email;Output: No output.Correct answer is option 'C'. 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 Consider the following SQL table definition:CREATE TABLE Customers (CustomerID INT PRIMARY KEY,CustomerName VARCHAR(50) NOT NULL,Email VARCHAR(50) UNIQUE);Which of the following SQL statements drops the unique constraint on the "Email" column?a)ALTER TABLE Customers DROP CONSTRAINT UNIQUE Email;b)ALTER TABLE Customers DROP UNIQUE Email;c)ALTER TABLE Customers DROP CONSTRAINT UQ_Customers_Email;d)ALTER TABLE Customers DROP UQ_Customers_Email;Output: No output.Correct answer is option 'C'. 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 Consider the following SQL table definition:CREATE TABLE Customers (CustomerID INT PRIMARY KEY,CustomerName VARCHAR(50) NOT NULL,Email VARCHAR(50) UNIQUE);Which of the following SQL statements drops the unique constraint on the "Email" column?a)ALTER TABLE Customers DROP CONSTRAINT UNIQUE Email;b)ALTER TABLE Customers DROP UNIQUE Email;c)ALTER TABLE Customers DROP CONSTRAINT UQ_Customers_Email;d)ALTER TABLE Customers DROP UQ_Customers_Email;Output: No output.Correct answer is option 'C'. Can you explain this answer?.
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