While working with dates in SQL, you may come across various questions. For those, these two functions will address you.
Those are to_date and to_char. Each function has its unique purpose. Below are the best examples for you.
Formatted date you can insert in SQL query. For that you can use the
to_date function; with it, the time can also be inserted.
Assume emp (empno, ename, hiredate)
insert into emp(empno,hiredate) values(101,to_date('dd-mon-yyhh:mi a.m.', '13-aug-09 09:30 a.m.'));
Converting date or number to a character string you can do it with the to_ char function.
To convert date:
TO_CHAR function, a date item can be formatted in many ways. The format must be enclosed within single quotes. Consider, 19-AUG-96 as the system date, then,
SELECT TO_CHAR(SYSDATE,'MONTH') FROM DUAL;
It will return August.
SQL>SELECT TO_CHAR(SYSDATE,'dd/mm/yyyy') FROM DUAL;
It will return 04/07/2009.
SELECT * FROM SALARY WHERE To_CHAR(SALARY_DATE, 'MM')='03';
It will return rows of March salary.
These two ways limit the number of rows return from an SQL query. These are helpful for Oracle and other SQL developers.
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