Accessing an entry from a dropdown connected to database

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Perhaps this way? This way, you do not need to query all the time.
You query just ONCE (normaly this should be faster).

import wixData from'wix-data';

var myDatabase = "HereTheNameOfYourDB"
var REFERENCE = "name"
var VALUE = $w('#userDropDown').value

$w.onReady(()=>{
   let QUERY = wixData.query("MyDatabase")
   
   $w('#userDropDown').onChange(()=>{
       QUERY.eq(REFERENCE, VALUE).find()
       .then((results) => {
          if(results.items.length > 0){
            let firstItem = results.items[0]
            let items = results.items
            let userData =  results.items[0].data 
            console.log(firstItem)
            console.log(items)
            console.log(userData)
            
            display_data_function(userData)
          } 
          else{  }
       })
       .catch((err) => {
          let errorMsg = err;
       });
   })
})

You can also use LIMITATION…(if you do not need to load the whole DB).

let QUERY = wixData.query("MyDatabase").limit(100)