asp.net barcode reader control Select MyRef,sum(Monday),sum(Tuesday),sum(Wednesday),sum(Thursday) from MyUnionQuery group by MyRef in Microsoft Office

Maker QR Code 2d barcode in Microsoft Office Select MyRef,sum(Monday),sum(Tuesday),sum(Wednesday),sum(Thursday) from MyUnionQuery group by MyRef

Select MyRef,sum(Monday),sum(Tuesday),sum(Wednesday),sum(Thursday) from MyUnionQuery group by MyRef
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The Delete Query
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The Delete query simply deletes records from a table It can either delete all of them or use a criterion Because it does not return records, it is run as a command: In its simplest form it appears this way:
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Delete * from MyTable
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This clears out all records from MyTable You can also use one or more criteria:
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Delete * from MyTable where CustomerName="Richard"
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This assumes that MyTable has a field called CutomerName This will delete all records where the CustomerName field is equal to Richard You can use the Query Design window to build a Delete query It is the same as the earlier Select query, but you must click the Delete query icon in the Query Type group of the ribbon It is a good idea to look at the results in a data sheet view (by clicking the View icon in the Results group of the ribbon) before you run the query This will show you what will be deleted without actually enacting the query If anything is wrong at this point, you have not damaged the database
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To run this from within VBA, you can use the DoCmd object (see 16 for more information on this object):
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Sub DeleteQuery() DoCmdSetWarnings False DoCmdOpenQuery "MyDeleteQuery" DoCmdSetWarnings True End Sub
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Notice that the DoCmd object has been used to switch the warning messages off and then switch them back on afterward This is because by running a Delete query the warning message will normally be displayed to tell you that you are about to delete records If you are running this as part of a VBA procedure, you will not want this message appearing and halting the execution of your code Do not forget to set the warnings back again If you do not, you will receive no warnings at any point within your Access database If, for example, you decide to edit a query and then close it, you will no longer get the warning message Do you want to save this It will default to Save, which could be disastrous if you have made changes that no longer work! You can also run this by using the Execute method You can either call the query or the actual SQL:
CurrentDbExecute "delete * from MyTable"
Do not forget that when deleting records memory is not released until the database is compacted If you do not do this, it will keep growing until you reach the 2Gb limit where it will be corrupted
Make Table Query
The Make Table query creates a new table based on the query If a table already exists with the same name, it will be overwritten, but you will see warning messages about this Because it does not return records, it is run as a command: In its simplest form, it appears as:
SELECT * INTO MyNewTable FROM MyTable;
This creates a copy of MyTable, calling it MyNewTable You can also use criteria:
SELECT * INTO MyNewTable FROM MyTable where CustomerName="Richard"
12: SQL Queries
This assumes that MyTable has a field called CutomerName This will create a new table called MyNewTable, which only contains records when the CustomerName field is equal to Richard You can use the Query Design window to build a Make Table query It is the same as the earlier Select query, but you must click the Make Table query icon in the Query Type group of the ribbon To run this from within VBA, use the DoCmd object (see 16 for more information on this object):
Sub MakeTableQuery() DoCmdSetWarnings False DoCmdOpenQuery "MyMakeTableQuery" DoCmdSetWarnings True End Sub
Notice that the DoCmd object has been used to switch the warning messages off and then switch them back on afterward This is because by running a Make Table query the warning message will normally be displayed to tell you that you are about to delete records If you are running this as part of a VBA procedure, you will not want this message appearing and halting the execution of your code Again, do not forget to set the warnings back as they were If you do not, you will receive no warnings at any point within your Access database If, for example, you decide to edit a query, and then close it, you will no longer get the warning message Do you want to save this It will default to Save, which could be disastrous if you have made changes that no longer work! You can also run this by using the Execute method This can be done by either calling the query or the actual SQL:
CurrentDbExecute "SELECT * INTO MyNewTable FROM MyTable;"
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