static String buildSelectSql(String table, String[] fields){
StringBuilder sb = new StringBuilder();
sb.append("SELECT ");
sb.append(String.join(", ",fields));
sb.append(" FROM ");
sb.append(table);
return sb.toString();
}

static String buildSelectSqltwo(String table, String[] fields){
StringJoiner sj = new StringJoiner(", ","SELECT "," FROM "+table);
for(String field : fields){
sj.add(field);
}
return sj.toString();
}