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Questions and Answers
Which clause follows the FROM clause in a SELECT statement?
Which clause follows the FROM clause in a SELECT statement?
What does the IS NULL operator do?
What does the IS NULL operator do?
Which data type represents a special value that indicates either unknown or inapplicable data?
Which data type represents a special value that indicates either unknown or inapplicable data?
Which arithmetic or comparison operator returns NULL when one or more operands are NULL?
Which arithmetic or comparison operator returns NULL when one or more operands are NULL?
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Which database model is based on a tabular data structure?
Which database model is based on a tabular data structure?
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Which sublanguage of SQL defines the structure of the database?
Which sublanguage of SQL defines the structure of the database?
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Which statement is used to create a new database in SQL?
Which statement is used to create a new database in SQL?
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Which database models were dominant in the 1960s and 1970s?
Which database models were dominant in the 1960s and 1970s?
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Which statement is used to select a default database for use in subsequent SQL statements?
Which statement is used to select a default database for use in subsequent SQL statements?
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What type of data were relational databases initially designed for?
What type of data were relational databases initially designed for?
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Which rule governs the number of values per cell in a table?
Which rule governs the number of values per cell in a table?
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What type of data is characterized by unprecedented data volumes and rapidly changing data structures?
What type of data is characterized by unprecedented data volumes and rapidly changing data structures?
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Which data type represents numbers with fractional values?
Which data type represents numbers with fractional values?
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Which data type category represents positive and negative integers?
Which data type category represents positive and negative integers?
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Which statement is used to delete a table and all its rows from a database?
Which statement is used to delete a table and all its rows from a database?
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Which operator computes a value from one or more other values?
Which operator computes a value from one or more other values?
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Which statement accurately describes referential integrity in a relational database?
Which statement accurately describes referential integrity in a relational database?
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Which action rejects an insert, update, or delete that violates referential integrity?
Which action rejects an insert, update, or delete that violates referential integrity?
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What does the action SET NULL do when a foreign key is invalid?
What does the action SET NULL do when a foreign key is invalid?
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What does the action SET DEFAULT do when a foreign key is invalid?
What does the action SET DEFAULT do when a foreign key is invalid?
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What does the action CASCADE do in relation to primary key changes?
What does the action CASCADE do in relation to primary key changes?
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What clauses specify the actions for primary key updates and deletes in MySQL?
What clauses specify the actions for primary key updates and deletes in MySQL?
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Which statement is true about the INSERT statement?
Which statement is true about the INSERT statement?
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Which statement is true about the UPDATE statement?
Which statement is true about the UPDATE statement?
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Which statement is true about the DELETE statement?
Which statement is true about the DELETE statement?
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Which statement is true about the TRUNCATE statement?
Which statement is true about the TRUNCATE statement?
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Which of the following is a correct statement about sets and tuples?
Which of the following is a correct statement about sets and tuples?
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Which of the following is a correct statement about tables and columns?
Which of the following is a correct statement about tables and columns?
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Which of the following is a correct statement about data types?
Which of the following is a correct statement about data types?
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Which of the following is a correct statement about relational operations?
Which of the following is a correct statement about relational operations?
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Which statement is true about named constraints in SQL?
Which statement is true about named constraints in SQL?
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What is the correct syntax for adding a named CHECK constraint to a table in SQL?
What is the correct syntax for adding a named CHECK constraint to a table in SQL?
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Which clause is used to drop a named UNIQUE constraint in SQL?
Which clause is used to drop a named UNIQUE constraint in SQL?
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What happens when a table contains data that violates a newly added constraint in SQL?
What happens when a table contains data that violates a newly added constraint in SQL?
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Which clause is used to drop a named constraint in SQL?
Which clause is used to drop a named constraint in SQL?
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Which statement is true about dropping a table in SQL?
Which statement is true about dropping a table in SQL?
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What is the correct syntax for adding a named PRIMARY KEY constraint to a table in SQL?
What is the correct syntax for adding a named PRIMARY KEY constraint to a table in SQL?
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Which statement is true about unnamed constraints in SQL?
Which statement is true about unnamed constraints in SQL?
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Which clause is used to drop a named FOREIGN KEY constraint in SQL?
Which clause is used to drop a named FOREIGN KEY constraint in SQL?
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What is the correct syntax for adding a named FOREIGN KEY constraint to a table in SQL?
What is the correct syntax for adding a named FOREIGN KEY constraint to a table in SQL?
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Which constraint governs values in a single column?
Which constraint governs values in a single column?
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Which constraint appears in a separate clause of a CREATE TABLE statement and governs values in one or more columns?
Which constraint appears in a separate clause of a CREATE TABLE statement and governs values in one or more columns?
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Where can the UNIQUE constraint be applied?
Where can the UNIQUE constraint be applied?
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What does the UNIQUE constraint ensure?
What does the UNIQUE constraint ensure?
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Is the UNIQUE constraint necessary for primary key columns?
Is the UNIQUE constraint necessary for primary key columns?
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What does MySQL create for each UNIQUE constraint?
What does MySQL create for each UNIQUE constraint?
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What does MySQL do when new values are inserted or updated with a UNIQUE constraint?
What does MySQL do when new values are inserted or updated with a UNIQUE constraint?
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Can a PRIMARY KEY constraint on a single column appear in the column declaration?
Can a PRIMARY KEY constraint on a single column appear in the column declaration?
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Can a PRIMARY KEY constraint on a composite column appear in the column declaration?
Can a PRIMARY KEY constraint on a composite column appear in the column declaration?
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Does a PRIMARY KEY constraint on a composite column require a separate CREATE TABLE clause?
Does a PRIMARY KEY constraint on a composite column require a separate CREATE TABLE clause?
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