Re: User variables + SUM + GROUP BY = strange behavior
well, it seems to be fine without SUM and GROUP BY... E.g., SELECT @a:=Charge, @b:=Cost, @[EMAIL PROTECTED] as Margin ... produces expected results. Emmett Bishop wrote: Vadim, if I'm not mistaken, you can't set a variable then use it in the same statement. See http://dev.mysql.com/doc/mysql/en/Variables.html A little ways down the page... The general rule is to never assign and use the same variable in the same statement. -- Tripp --- Vadim P. [EMAIL PROTECTED] wrote: Sorry, the message got garbled, here is a more digestible look: -Original Message- Hello all, Could anyone comment on User Variable behavior in the example below? Thanks, Vadim. = mysql SELECT -LEFT(CallTime,10) AS CallDate, -@a := SUM(Charge), -@b := SUM(Cost), -@a - @b, -@a, -@b - FROM Calls - GROUP by CallDate - ORDER BY CallDate DESC; ++--++-++- | CallDate | @a:= SUM(Charge) | @b:= SUM(Cost) | @a - @b | @a | @b ++--++-++- ... | 2004-03-01 | 621.059 |249.310 | 30.882 | 39.512 | 8.63 | 2004-02-29 | 54.620 | 17.660 | 30.882 | 39.512 | 8.63 | 2004-02-28 | 205.581 | 17.460 | 30.882 | 39.512 | 8.63 | 2004-02-27 | 622.282 |248.920 | 30.882 | 39.512 | 8.63 | 2004-02-26 | 607.274 |277.100 | 30.882 | 39.512 | 8.63 | 2004-02-25 | 709.698 |308.580 | 30.882 | 39.512 | 8.63 | 2004-02-24 | 783.210 |298.560 | 30.882 | 39.512 | 8.63 | 2004-02-23 | 799.764 |252.890 | 30.882 | 39.512 | 8.63 ... -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED] __ Do you Yahoo!? Yahoo! Tax Center - File online by April 15th http://taxes.yahoo.com/filing.html -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
Re: User variables + SUM + GROUP BY = strange behavior
Not sure on how exactly variables work in MySQL but I do know that according to ANSI SQL group bys are done before other things in the query. So your query would perform the group by then it would do the actual select. This could be one reason for strange results. Thanks, Andrew From: Vadim P. [EMAIL PROTECTED] To: Emmett Bishop [EMAIL PROTECTED] CC: [EMAIL PROTECTED] Subject: Re: User variables + SUM + GROUP BY = strange behavior Date: Fri, 16 Apr 2004 05:50:12 -0400 well, it seems to be fine without SUM and GROUP BY... E.g., SELECT @a:=Charge, @b:=Cost, @[EMAIL PROTECTED] as Margin ... produces expected results. Emmett Bishop wrote: Vadim, if I'm not mistaken, you can't set a variable then use it in the same statement. See http://dev.mysql.com/doc/mysql/en/Variables.html A little ways down the page... The general rule is to never assign and use the same variable in the same statement. -- Tripp --- Vadim P. [EMAIL PROTECTED] wrote: Sorry, the message got garbled, here is a more digestible look: -Original Message- Hello all, Could anyone comment on User Variable behavior in the example below? Thanks, Vadim. = mysql SELECT -LEFT(CallTime,10) AS CallDate, -@a := SUM(Charge), -@b := SUM(Cost), -@a - @b, -@a, -@b - FROM Calls - GROUP by CallDate - ORDER BY CallDate DESC; ++--++-++- | CallDate | @a:= SUM(Charge) | @b:= SUM(Cost) | @a - @b | @a | @b ++--++-++- ... | 2004-03-01 | 621.059 |249.310 | 30.882 | 39.512 | 8.63 | 2004-02-29 | 54.620 | 17.660 | 30.882 | 39.512 | 8.63 | 2004-02-28 | 205.581 | 17.460 | 30.882 | 39.512 | 8.63 | 2004-02-27 | 622.282 |248.920 | 30.882 | 39.512 | 8.63 | 2004-02-26 | 607.274 |277.100 | 30.882 | 39.512 | 8.63 | 2004-02-25 | 709.698 |308.580 | 30.882 | 39.512 | 8.63 | 2004-02-24 | 783.210 |298.560 | 30.882 | 39.512 | 8.63 | 2004-02-23 | 799.764 |252.890 | 30.882 | 39.512 | 8.63 ... -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED] __ Do you Yahoo!? Yahoo! Tax Center - File online by April 15th http://taxes.yahoo.com/filing.html -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED] _ Get rid of annoying pop-up ads with the new MSN Toolbar FREE! http://toolbar.msn.com/go/onm00200414ave/direct/01/ -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
User variables + SUM + GROUP BY = strange behavior
Hello all, Could anyone comment on User Variable behavior in the example below? Thanks, Vadim. = mysql SELECT - LEFT(CallTime,10) AS CallDate, - @a := SUM(Charge), - @b := SUM(Cost), - @a - @b, - @a, - @b - FROM Calls - GROUP by CallDate - ORDER BY CallDate DESC; ++---+-+-++- -+ | CallDate | @a := SUM(Charge) | @b := SUM(Cost) | @a - @b | @a | @b | ++---+-+-++- -+ . | 2004-03-01 | 621.059 | 249.310 | 30.882 | 39.512 | 8.63 | | 2004-02-29 |54.620 | 17.660 | 30.882 | 39.512 | 8.63 | | 2004-02-28 | 205.581 | 17.460 | 30.882 | 39.512 | 8.63 | | 2004-02-27 | 622.282 | 248.920 | 30.882 | 39.512 | 8.63 | | 2004-02-26 | 607.274 | 277.100 | 30.882 | 39.512 | 8.63 | | 2004-02-25 | 709.698 | 308.580 | 30.882 | 39.512 | 8.63 | | 2004-02-24 | 783.210 | 298.560 | 30.882 | 39.512 | 8.63 | | 2004-02-23 | 799.764 | 252.890 | 30.882 | 39.512 | 8.63 | .
User variables + SUM + GROUP BY = strange behavior
Sorry, the message got garbled, here is a more digestible look: -Original Message- Hello all, Could anyone comment on User Variable behavior in the example below? Thanks, Vadim. = mysql SELECT - LEFT(CallTime,10) AS CallDate, - @a := SUM(Charge), - @b := SUM(Cost), - @a - @b, - @a, - @b - FROM Calls - GROUP by CallDate - ORDER BY CallDate DESC; ++--++-++- | CallDate | @a:= SUM(Charge) | @b:= SUM(Cost) | @a - @b | @a | @b ++--++-++- ... | 2004-03-01 | 621.059 |249.310 | 30.882 | 39.512 | 8.63 | 2004-02-29 | 54.620 | 17.660 | 30.882 | 39.512 | 8.63 | 2004-02-28 | 205.581 | 17.460 | 30.882 | 39.512 | 8.63 | 2004-02-27 | 622.282 |248.920 | 30.882 | 39.512 | 8.63 | 2004-02-26 | 607.274 |277.100 | 30.882 | 39.512 | 8.63 | 2004-02-25 | 709.698 |308.580 | 30.882 | 39.512 | 8.63 | 2004-02-24 | 783.210 |298.560 | 30.882 | 39.512 | 8.63 | 2004-02-23 | 799.764 |252.890 | 30.882 | 39.512 | 8.63 ... -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
Re: User variables + SUM + GROUP BY = strange behavior
Vadim, if I'm not mistaken, you can't set a variable then use it in the same statement. See http://dev.mysql.com/doc/mysql/en/Variables.html A little ways down the page... The general rule is to never assign and use the same variable in the same statement. -- Tripp --- Vadim P. [EMAIL PROTECTED] wrote: Sorry, the message got garbled, here is a more digestible look: -Original Message- Hello all, Could anyone comment on User Variable behavior in the example below? Thanks, Vadim. = mysql SELECT -LEFT(CallTime,10) AS CallDate, -@a := SUM(Charge), -@b := SUM(Cost), -@a - @b, -@a, -@b - FROM Calls - GROUP by CallDate - ORDER BY CallDate DESC; ++--++-++- | CallDate | @a:= SUM(Charge) | @b:= SUM(Cost) | @a - @b | @a | @b ++--++-++- ... | 2004-03-01 | 621.059 |249.310 | 30.882 | 39.512 | 8.63 | 2004-02-29 | 54.620 | 17.660 | 30.882 | 39.512 | 8.63 | 2004-02-28 | 205.581 | 17.460 | 30.882 | 39.512 | 8.63 | 2004-02-27 | 622.282 |248.920 | 30.882 | 39.512 | 8.63 | 2004-02-26 | 607.274 |277.100 | 30.882 | 39.512 | 8.63 | 2004-02-25 | 709.698 |308.580 | 30.882 | 39.512 | 8.63 | 2004-02-24 | 783.210 |298.560 | 30.882 | 39.512 | 8.63 | 2004-02-23 | 799.764 |252.890 | 30.882 | 39.512 | 8.63 ... -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED] __ Do you Yahoo!? Yahoo! Tax Center - File online by April 15th http://taxes.yahoo.com/filing.html -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
