Base date regarding the issue of SQL

create table emp (empname varchar2 (35), join_date date);

Insert into emp VALUES ('JOHN', TO_DATE (March 23, 2005 09:00 ',' DD-MON-YYYY HH24 '));

insert into emp VALUES ('HANS', TO_DATE (February 14, 2012 14:00 ',' DD-MON-YYYY HH24 '));

commit;

SQL > alter session set nls_Date_format = 'DD-MON-YYYY HH24. "

Modified session.

SQL > select * from emp;

EMPNAME JOIN_DATE

----------------------------------- -----------------

JOHN ON MARCH 23, 2005 09:00

HANS FEBRUARY 14, 2012 14:00

To find all employees who have joined the date of March 23, 2005, I need to do the following.

Y at - it a shorter version for this request?

SQL > select * from emp where JOIN_DATE > TO_DATE (March 23, 2005 00:00 ') AND JOIN_DATE < TO_DATE (March 24, 2005 00:00 ');

EMPNAME JOIN_DATE

----------------------------------- -----------------

JOHN ON MARCH 23, 2005 09:00

Hello

N.Page wrote:

create table emp (empname varchar2 (35), join_date date);

Insert into emp VALUES ('JOHN', TO_DATE (March 23, 2005 09:00 ',' DD-MON-YYYY HH24 '));

insert into emp VALUES ('HANS', TO_DATE (February 14, 2012 14:00 ',' DD-MON-YYYY HH24 '));

commit;

SQL > alter session set nls_Date_format = 'DD-MON-YYYY HH24. "

Modified session.

SQL > select * from emp;

EMPNAME JOIN_DATE

----------------------------------- -----------------

JOHN ON MARCH 23, 2005 09:00

HANS FEBRUARY 14, 2012 14:00

To find all employees who have joined the date of March 23, 2005, I need to do the following.

Y at - it a shorter version for this request?

SQL > select * from emp where JOIN_DATE > TO_DATE (March 23, 2005 00:00 ') AND JOIN_DATE< to_date="" ('24-mar-2005="">

EMPNAME JOIN_DATE

----------------------------------- -----------------

JOHN ON MARCH 23, 2005 09:00

You mean > = instead of >, to register the join_dates that are exactly 12:00:00 AM on March 23.  Keep< at="" the="" end;="" you="" don't="" want="" anything="" from="" march="" 24,="" and="" you="" don't="" want="" between="" for="" the="" same="">

What you posted is the fastest way.  Use DATE instead of TO_DATE literals, it is a bit shorter and just as fast.

SELECT *.

WCP

WHERE join_date > = DATE '' 2005-03-23

AND join_date<  date="">

;

May be the shortest path (which will be slower):

SELECT *.

WCP

WHERE TRUNC (join_date) = DATE '' 2005-03-23

;

It's slower because we need to call a function for each row in the table, and (potentially much larger) this means that you cannot use an index on join_date.

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