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SQL Interview Questions & Answers

September 15, 2022
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What is the full form of SQL?
- a) Structured Query List
- b) Structure Query Language
- c) Sample Query Language
- d) None of these
Answer - b) Structure Query Language

SQL stands for Structured Query Language. SQL lets you access and manipulate databases. SQL became a standard of the American National Standards Institute (ANSI) in 1986, and of the International Organization for Standardization (ISO) in 1987.
Which of the following is not a valid SQL type?
- a) FLOAT
- b) NUMERIC
- c) DECIMAL
- d) CHARACTER
Answer - c) DECIMAL

DECIMAL is not a valid SQL type because it is nothing but numeric only in SQL.
NUMERIC has fixed precision, and scale numbers range from -10^38+1 to 10^38-1.
FLOAT has floating precision number ranges from -1.79E + 308 to 1.79E + 308.
CHARACTER is a fixed-width character string data type that can be up to 8000 characters.