Oracle
field type is VARCHAR2, format to match formatted style
That day
SELECT * FROM table name where To_char (to_date (field name, ' Yyyy-mm-dd hh24:mi:ss '), ' DD ') =to_char (sysdate, ' DD ')
When the week
SELECT * FROM table name where To_char (to_date (field name, ' Yyyy-mm-dd hh24:mi:ss '), ' IW ') =to_char (sysdate, ' IW ')
Month
SELECT * FROM table name where To_char (to_date (field name, ' Yyyy-mm-dd hh24:mi:ss '), ' mm ') =to_char (sysdate, ' mm ')
When the quarter
SELECT * FROM table name where To_char (to_date (field name, ' Yyyy-mm-dd hh24:mi:ss '), ' Q ') =to_char (sysdate, ' Q ')
field type is date
That day
SELECT * FROM table name where To_char (field name, ' DD ') =to_char (sysdate, ' DDS ')
When the week
SELECT * FROM table name where To_char (field name, ' IW ') =to_char (sysdate, ' IW ')
Month
SELECT * FROM table name where To_char (field name, ' mm ') =to_char (sysdate, ' ' mm ')
When the quarter
SELECT * FROM table name where To_char (field name, ' Q ') =to_char (sysdate, ' Q ')
Sql
That day
SELECT * FROM table name where DATEPART (dd, field name) = DATEPART (dd, GETDATE ()) and DATEPART (mm, field name) = DATEPART (mm, GETDATE ()) and DATE Part (yy, field name) = DATEPART (yy, GETDATE ())
When the week
SELECT * FROM table name where DATEPART (wk, field name) = DATEPART (wk, GETDATE ()) and DATEPART (yy, field name) = DATEPART (yy, GETDATE ())
Month
SELECT * FROM table name where DATEPART (mm, field name) = DATEPART (mm, GETDATE ()) and DATEPART (yy, field name) = DATEPART (yy, GETDATE ())
When the quarter
SELECT * FROM table name where DATEPART (QQ, field name) = DATEPART (QQ, GETDATE ()) and DATEPART (yy, field name) = DATEPART (yy, GETDATE ())
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