SQL query for extracting year from a date

问题

I am trying to create a query that gets only the year from selected dates. I.e. select ASOFDATE from PSASOFDATE; returns 11/15/2012, but I want only 2012. How can I get only the year? I know the YEAR function can be used, but I'm not sure how.

回答1:

SELECT YEAR(ASOFDATE) FROM PASOFDATE

Editted: In anycase if your date is a String, let's convert it into a proper date format. And select the year out of it.

SELECT YEAR(STR_TO_DATE(ASOFDATE, '%d-%b-%Y')) FROM PSASOFDATE

Since you are trying Toad, can you check the following code:

SELECT EXTRACT (TO_DATE(YEAR, 'MM/DD/YY') FROM ASOFDATE) FROM PSASOFDATE;

Reference:

回答2:

This worked for me:

SELECT EXTRACT(YEAR FROM ASOFDATE) FROM PSASOFDATE;

回答3:

How about this one?

SELECT TO_CHAR(ASOFDATE, 'YYYY') FROM PSASOFDATE

回答4:

just pass the columnName as parameter of YEAR

SELECT YEAR(ASOFDATE) from PSASOFDATE;

another is to use DATE_FORMAT

SELECT DATE_FORMAT(ASOFDATE, '%Y') from PSASOFDATE;

• SQLFiddle Demo

UPDATE 1

I bet the value is varchar with the format MM/dd/YYYY, it that's the case,

SELECT YEAR(STR_TO_DATE('11/15/2012', '%m/%d/%Y'));

• SQLFiddle Demo

LAST RESORT if all the queries fail

use SUBSTRING

SELECT SUBSTRING('11/15/2012', 7, 4)

• SQLFiddle Demo

来源：https://stackoverflow.com/questions/13455440/sql-query-for-extracting-year-from-a-date