javascript - "SELECT MAX(rowid) FROM table" query works only after "SELECT * FROM table" has been called -

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the below function in javascript file. intent return maximum value in rowid column of sqlite database. currently, works after "select * table query" has been run. why this? 

function lastrecord(){   db.transaction(function (tx) {       tx.executesql('select max(rowid) mr surveys', [], function(tx, results){   var maxrowid = results.rows.item(0).mr;   alert(maxrowid); }); }); }

i appreciate clarification regarding needs loaded select max(rowid) show correct max rowid value every time function called. standard format (structure) implementing max function? thanks.

have tried using order , limit? 

select rowid mr surveys order rowid desc limit 1

might work better you.


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