datarow select .Erreur de syntaxe : opérande manquant après l'opérateur 'WHERE'.

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i'm trying to select the max of a date of a specific device,but i'm getting the error "the operand is missing after the operator "where".

C#

max=t.GetData().Select("MAX(time) WHERE EQUIPEMENT_REF='mydevice'")[0].ItemArray[1].ToString();

thanks for your help

Posted 12-Apr-13 8:18am

Member 9870058

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Richard C Bishop 12-Apr-13 14:22pm

What is "t"?

Member 9870058 12-Apr-13 14:39pm

nmsdbDataSetTableAdapters.temperatureTableAdapter t = new nmsdbDataSetTableAdapters.temperatureTableAdapter();

Member 9870058 12-Apr-13 14:40pm

if i remove where equipement_ref=mydevice it works but it shows the max of the date of all the devices

Richard C Bishop 12-Apr-13 14:42pm

My guess is "mydevice" is the issue. Do you need a dynamic variable there?

Member 9870058 12-Apr-13 14:51pm

yes,that's the problem,actualy i need the max date of a device identified by its id

Member 9870058 12-Apr-13 15:06pm

i solved the problem,i had to put "and" between the 2 criterias.
thanks for your help

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Member 9870058 · Accepted Answer · 2013-04-12T09:07:00

i solved the problem ,first of all if you need to put more than critere you have to put and between,second for to get the max date for a specfic device i had to sort the result and choose the first one

SQL

max = o.GetData().Select("equipement_ref='mydevice'","time DESC")[0].ItemArray[1].ToString();
               min = o.GetData().Select("equipement_ref='mydevice'", "time ASC")[0].ItemArray[1].ToString();