This is a quiz on the SQL system. Needed for learning at school
COUNT
AVG
STDDEV
VARIANCE
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COUNT(*) returns the number of rows in the table.
COUNT(DISTINCT exp) returns the number of unique, non-null values in the column
COUNT(DISTINCT exp) returns the number of unique, non-null values in the column
All are true.
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The join condition is not separated from other search conditions in a query
The ON clause makes code difficult to understand
The join condition for natural join is basically an equijoin of all columns with same name.
None of the above.
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IBM
DELL
SQL
Microsoft
Apple
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A question
Desire results
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Donald D. Chamberlin
Raymond F. Boyce
Jerron Q. Refter
Both A & B
Both A & C
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The INSERT INTO statement is used for inserting new rows to a table
You cannot insert rows with NULL values to a table.
You may insert a new row containing values for each column.
All of the above.
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1974
1922
1977
1987
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The complexity and size of the SQL standard means that most databases DO NOT implement the entire standard.
The simplicity and size of the SQL standard means that most databases DO implement the entire standard.
The simplicity and size of the SQL standard means that most databases DO NOT implement the entire standard.
The complexity and size of the SQL standard means that most databases DO implement the entire standard.
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