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what is the difference between static class and singleton class? can we create static class?
L&T, Octazen, Vamsi Labs,
2 Core Java 6067
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What are various constraints used in SQL?
Answer
NOT NULL - Indicates that a column cannot store NULL value
UNIQUE - Ensures that each row for a column must have a unique value
PRIMARY KEY - A combination of a NOT NULL and UNIQUE. Ensures that a column (or combination of two or more columns) have an unique identity which helps to find a particular record in a table more easily and quickly
FOREIGN KEY - Ensure the referential integrity of the data in one table to match values in another table
CHECK - Ensures that the value in a column meets a specific condition
DEFAULT - Specifies a default value when specified none for this column
| Is This Answer Correct ? | 2 Yes | 0 No |
