sql first day of current year
SELECT DATEADD(yy, DATEDIFF(yy, 0, GETDATE()), 0); -- SQL Server
SELECT TRUNC(sysdate, 'YEAR') FROM DUAL; -- Oracle
SELECT MAKEDATE(year(now()), 1); -- MySQL
sql first day of current year
SELECT DATEADD(yy, DATEDIFF(yy, 0, GETDATE()), 0); -- SQL Server
SELECT TRUNC(sysdate, 'YEAR') FROM DUAL; -- Oracle
SELECT MAKEDATE(year(now()), 1); -- MySQL
sql first day quarter
-- trunc(date, format) DUAL is for Oracle
SELECT trunc(sysdate, 'Q') FROM DUAL; -- 1rst quarter day
SELECT trunc(sysdate) FROM DUAL; -- today 00:00:00
SELECT trunc(sysdate, 'YEAR') FROM DUAL; -- 1rst year day
SELECT trunc(sysdate, 'MONTH') FROM DUAL; -- 1rst month day
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