COMPUTER SCIENCE AND ENGINEERING
SQL
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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some random values from the given column
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the total number of columns in the database
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the total number of tables in the given databases
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the total sum of a given numeric column
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Detailed explanation-1: -The SUM() function adds all values from the quantity column and returns the total as the result of the function. The name of the new result column (i.e. the alias) is sum quantity . As you see, the sum of values in the quantity column in the table product is 7.
Detailed explanation-2: -The SUM() function returns the total sum of a numeric column.
Detailed explanation-3: -Pandas DataFrame sum() Method The sum() method adds all values in each column and returns the sum for each column. By specifying the column axis ( axis=’columns’ ), the sum() method searches column-wise and returns the sum of each row.
Detailed explanation-4: -SUM returns data type INTEGER for an expression with data type INT, SMALLINT, or TINYINT. SUM returns data type BIGINT for an expression with data type BIGINT. SUM returns data type DOUBLE for an expression with data type DOUBLE. For all other numeric data types, SUM returns data type NUMERIC.
Detailed explanation-5: -The SQL SUM function is an aggregate function that is used to perform a calculation on a set of values from a specified expression and return a single value in their output.