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DATE

In GlueSQL, the DATE data type is used to store date values in the format 'YYYY-MM-DD'. Note that GlueSQL currently does not support timezones.

Creating a table with DATE columns​

To create a table with columns of type DATE, use the CREATE TABLE statement:

CREATE TABLE DateLog (
    id INTEGER,
    date1 DATE,
    date2 DATE
);

Inserting data into a table with DATE columns​

To insert data into a table with DATE columns, use the INSERT INTO statement:

INSERT INTO DateLog VALUES
    (1, '2020-06-11', '2021-03-01'),
    (2, '2020-09-30', '1989-01-01'),
    (3, '2021-05-01', '2021-05-01');

Querying data from a table with DATE columns​

To query data from a table with DATE columns, use the SELECT statement:

SELECT id, date1, date2 FROM DateLog;

Filtering data using DATE columns​

You can use various comparison operators like >, <, <=, >=, and = to filter data based on DATE columns:

SELECT * FROM DateLog WHERE date1 > date2;

SELECT * FROM DateLog WHERE date1 <= date2;

SELECT * FROM DateLog WHERE date1 = DATE '2020-06-11';

SELECT * FROM DateLog WHERE date2 < '2000-01-01';

SELECT * FROM DateLog WHERE '1999-01-03' < DATE '2000-01-01';

Performing date arithmetic​

You can perform arithmetic operations on DATE columns using INTERVAL and various date arithmetic operators:

SELECT
    id,
    date1 - date2 AS date_sub,
    date1 - INTERVAL '1' DAY AS sub,
    date2 + INTERVAL '1' MONTH AS add
FROM DateLog;

Handling invalid date values​

If you try to insert an invalid date value into a DATE column, GlueSQL will return an error:

INSERT INTO DateLog VALUES (1, '12345-678', '2021-05-01');

This will result in an error similar to the following:

failed to parse date 12345-678

Conclusion​

In summary, the DATE data type in GlueSQL allows you to store and manipulate date values in your database. You can create tables with DATE columns, insert and query data, filter data based on date comparisons, and perform date arithmetic using various operators and intervals. Always remember to use valid date formats when inserting data into DATE columns to avoid errors.