执行1条sql select命令，该命令仅适用于表中的前100条记录

Question

我的问题是，当我执行select命令时，应用程序运行非常缓慢，因为我正在从具有10000records的表中进行选择，但始终只能处理大约前100条记录。是否可以选择说说选择而不是从所有表中选择-例如。是否要从表格中进行选择，但只能使用前100个记录？

$time = mysql_query("KBD, jobNumber, truckid, SUM(pallets) as count_pallets, SUM(cartons) as count_cartons, COUNT(*) as pocet FROM incoming WHERE availableDate = '$today_date' AND slotTime = '$time' GROUP BY truckid,forwarder");

Answer 1

您可以通过在末尾添加limit子句来限制mysql中的记录数量。

$time = mysql_query
("KBD, jobNumber, truckid, SUM(pallets) as count_pallets, 
SUM(cartons) as count_cartons, COUNT(*) as pocet 
FROM incoming 
WHERE availableDate = '$today_date' 
AND slotTime = '$time' 
GROUP BY truckid,forwarder 
LIMIT 100"
);