I've a problem when using Select features using an expression. I've an attribute table with many features: It's a shapefile from a previous CSV table. The data are localities for water analysis, where several parameters appear. But I only want few of those locations.
What I do is:in Attribute table, I open Select by Expression, Then in Fields and Values, I select my column of interest
"Parameters", and from Load Values- All Unique button, I choose the names I want to pick :
The expression I use is:
"Parametro" = 'alfa-Hexaclorociclohexano' + 'beta-Hexaclorociclohexano' + 'delta-Hexaclorociclohexano' + 'gamma-Hexaclorociclohexano'
But I can't select my values... If I just pick every value independently, i.e.:
'alfa-Hexaclorociclohexano', they are selected. Then, what my problem can be ?, should I not use the
+ symbol ? I also tried with the
And symbol, but it's not working either. Should I try another option like the Query Builder ?
Select by Expression seemed the easier option to me but I'm not able to continue.