Interval Type and Date Type

Operation Between Interval Type and Date Type not Supported

Description

INTERVAL YEAR TO MONTH and INTERVAL DAY TO SECOND are not a supported data type, they are transformed to VARCHAR(20). Therefore all arithmetic operations between Date Types and the original Interval Type Columns are not supported.

Furthermore, operations between an Interval Type and Date Type (in this order) are not supported in Snowflake; and these operations use this EWI as well.

Example Code

Input Code Oracle:

IN -> Oracle_01.sql

CREATE TABLE table_with_intervals
(
    date_col DATE,
    time_col TIMESTAMP,
    intervalYearToMonth_col INTERVAL YEAR TO MONTH,
    intervalDayToSecond_col INTERVAL DAY TO SECOND
);

-- Date + Interval Y to M
SELECT date_col + intervalYearToMonth_col FROM table_with_intervals;

-- Date - Interval D to S
SELECT date_col - intervalDayToSecond_col FROM table_with_intervals;

-- Timestamp + Interval D to S
SELECT time_col + intervalDayToSecond_col FROM table_with_intervals;

-- Timestamp - Interval Y to M
SELECT time_col - intervalYearToMonth_col FROM table_with_intervals;

Output Code:

OUT -> Oracle_01.sql

CREATE OR REPLACE TABLE table_with_intervals
    (
        date_col TIMESTAMP,
        time_col TIMESTAMP(6),
        intervalYearToMonth_col VARCHAR(20) !!!RESOLVE EWI!!! /*** SSC-EWI-0036 - INTERVAL YEAR TO MONTH DATA TYPE CONVERTED TO VARCHAR ***/!!!,
        intervalDayToSecond_col VARCHAR(20) !!!RESOLVE EWI!!! /*** SSC-EWI-0036 - INTERVAL DAY TO SECOND DATA TYPE CONVERTED TO VARCHAR ***/!!!
    )
    COMMENT = '{"origin":"sf_sc","name":"snowconvert","version":{"major":1, "minor":0},{"attributes":{"component":"oracle"}}'
    ;

    -- Date + Interval Y to M
    SELECT date_col + intervalYearToMonth_col FROM
    table_with_intervals;

    -- Date - Interval D to S
SELECT date_col - intervalDayToSecond_col FROM
    table_with_intervals;

    -- Timestamp + Interval D to S
SELECT time_col + intervalDayToSecond_col FROM
    table_with_intervals;

    -- Timestamp - Interval Y to M
SELECT time_col - intervalYearToMonth_col FROM
    table_with_intervals;

Recommendations

• Implement the UDF to simulate the Oracle behavior.

• Extract the already transformed value that was stored in the column during migration, and use it as a Snowflake Interval Constant when possible.
• If you need more support, you can email us at [e-mail]

Related EWIS

1. SSC-EWI-0036: INTERVAL LITERAL IS NOT SUPPORTED BY SNOWFLAKE IN THIS SCENARIO