Common questions

What is the return type of Impala date and time?

What is the return type of Impala date and time?

If either argument is NULL, the result is NULL . Return type: INT (either -1, 0, 1, or NULL ) Added in: Impala 2.3.0 Usage notes: Usage notes: A comparison function for TIMESTAMP values that only tests whether the date and time increases, decreases, or stays the same. Similar to the SIGN () function for numeric values.

How to normalize a nonexistent date in Impala?

The following example shows how the nonexistent date April 31st is normalized to April 30th: 0 if the dates are identical. 1 if date1 > date2 . -1 if date1 < date2 . NULL if date1 or date2 is NULL . Purpose: Similar to EXTRACT () , with the argument order reversed. Supports the same date and time units as EXTRACT ().

How is the interval notation used in Impala?

The following examples show the shorthand notation of an INTERVAL expression, instead of specifying the precise number of days. The INTERVAL notation also lets you work with units smaller than a single day.

What was the wheelbase of the Chevy Impala in 1959?

The 1959 Chevrolet Impala was redesigned. Sharing bodyshells with lower-end Buicks and Oldsmobiles as well as with Pontiac, part of a GM economy move, the Chevrolet’s wheelbase was 1-1/2 inches longer.

How is the day value NULL in Impala?

The following examples show how the day value is NULL for nonexistent dates or misformatted date strings. Purpose: Returns the day field from a TIMESTAMP value, converted to the string corresponding to that day name. The range of return values is ‘Sunday’ to ‘Saturday’.

How to calculate a delta value in Impala?

With an INTERVAL expression as the second argument, you can calculate a delta value using other units such as weeks, years, hours, seconds, and so on; see TIMESTAMP Data Type for details. If date is TIMESTAMP, returns TIMESTAMP . If date is DATE, returns DATE .

When to use trunc OR SELECT statement in Impala?

SELECT statement to insert into a partitioned table to split up TIMESTAMP values into individual parts, if the partitioned table has separate partition key columns representing year, month, day, and so on. If you need to divide by more complex units of time, such as by week or by quarter, use the TRUNC () function instead.

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