jqgrid报表报错

jqgrid表格报错
SQLSTATE[42S22]: Column not found: 1054 Unknown column 'payments' in 'field list'

<br /><?php<br />require_once '../../../jq-config.php';<br />// include the jqGrid Class<br />require_once ABSPATH."php/jqGrid.php";<br />// include the driver class<br />require_once ABSPATH."php/jqGridPdo.php";<br />// Connection to the server<br />$conn = new PDO(DB_DSN,DB_USER,DB_PASSWORD);<br />// Tell the db that we use utf-8<br />$conn->query("SET NAMES utf8");<br /><br />// Create the jqGrid instance<br />$grid = new jqGridRender($conn);<br />// Write the SQL Query<br />$grid->SelectCommand = 'SELECT id,order_id,payments-date FROM `sale_orders`';<br />// set the ouput format to json<br />$grid->dataType = 'json';<br />// Let the grid create the model from SQL query<br />$grid->setColModel();<br />// Set the url from where we obtain the data<br />$grid->setUrl('grid.php');<br />// Set alternate background using altRows property<br />$grid->setGridOptions(array(<br />    "rowNum"=>10,<br />    "sortname"=>"id",<br />    "altRows"=>true,<br />    "multiselect"=>true,<br />    "rowList"=>array(10,20,50),<br />    ));<br />// Change some property of the field(s)<br />$grid->setColProperty("id", array("label"=>"ID", "width"=>60));<br />$grid->setColProperty("payments-date", array(<br />    "formatter"=>"date",<br />    "formatoptions"=>array("srcformat"=>"Y-m-d H:i:s","newformat"=>"m/d/Y")<br />    )<br />);<br />// Enjoy<br />$grid->renderGrid('#grid','#pager',true, null, null, true,true);<br />$conn = null;<br />?><br />

------解决方案--------------------
字段名是 payments-date 吗？中间有减号？
`payments-date`