‘Not Like’ in Dynamics AX

In X++, we can use Like ‘*someIdentifier’ to implement the Like keyword.
e.g.
select firstonly purchTable
where purchTable.purchId like 00007*‘;
However if you want to use ‘Not Like’ in X++ SQL statement, you have three options:
The first option, using ‘!’ as ‘not’,
e.g.
select firstonly purchTable
where !(purchTable.purchId like ‘00007*‘);
The second option, using notExists join
e.g.
PurchTable purchTable, refPurchTable;
;
select firstonly purchTable
notExists join refPurchTable
where purchTable.purchId ==00007*‘;

Please make sure that you do put purchTable.purchId in condition statement, otherwise the SQL statement will retrieve an empty result set.
The last option, using Query
e.g.
Query query = new Query();
QueryRun queryRun;
;

query.addDataSource(tableNum(PurchTable)).addRange(fieldNum(PurchTable, PurchId)).value(‘!00007*‘);
queryRun = new QueryRun(query);
if(queryRun.next())
{
purchTable = queryRun.get(tableNum(PurchTable));
print purchTable.PurchId;
pause;
}
Using NotExists join seems more complicated than the first option, but actually there is no performance difference between them.
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