Php 将当前记录与上一记录进行比较

我是PHP和MySQL新手。我用谷歌搜索了几个论坛，但不知道如何让这个查询起作用。希望你们能指引我。

ITEMINFO

--------------------------------------
| ItemNo | Description       | Price |
| AAAAA  | AAAAA description | $1.11 |
| BBBBB  | BBBBB description | $2.22 |
| CCCCC  | CCCCC description | $3.33 |

-----------------------------------------------------------
| StoreNo | Add1        | Add2 | City     | State | Zip   |
| 11111   | 111 Main St | # 1  | New York | NY    | 10001 |
| 22222   | 222 Main St | # 2  | New York | NY    | 10001 |
| 33333   | 333 Main St | # 3  | New York | NY    | 10001 |
| 44444   | 444 Main St | # 4  | New York | NY    | 10001 |

-------------------------------
| StoreNo | Quantity | ItemNo |
| 11111   | 10       | AAAAA  |
| 11111   | 5        | BBBBB  |
| 33333   | 50       | BBBBB  |
| 22222   | 20       | AAAAA  |

STOREINFO

--------------------------------------
| ItemNo | Description       | Price |
| AAAAA  | AAAAA description | $1.11 |
| BBBBB  | BBBBB description | $2.22 |
| CCCCC  | CCCCC description | $3.33 |

-----------------------------------------------------------
| StoreNo | Add1        | Add2 | City     | State | Zip   |
| 11111   | 111 Main St | # 1  | New York | NY    | 10001 |
| 22222   | 222 Main St | # 2  | New York | NY    | 10001 |
| 33333   | 333 Main St | # 3  | New York | NY    | 10001 |
| 44444   | 444 Main St | # 4  | New York | NY    | 10001 |

-------------------------------
| StoreNo | Quantity | ItemNo |
| 11111   | 10       | AAAAA  |
| 11111   | 5        | BBBBB  |
| 33333   | 50       | BBBBB  |
| 22222   | 20       | AAAAA  |

STOREORDER

--------------------------------------
| ItemNo | Description       | Price |
| AAAAA  | AAAAA description | $1.11 |
| BBBBB  | BBBBB description | $2.22 |
| CCCCC  | CCCCC description | $3.33 |

-----------------------------------------------------------
| StoreNo | Add1        | Add2 | City     | State | Zip   |
| 11111   | 111 Main St | # 1  | New York | NY    | 10001 |
| 22222   | 222 Main St | # 2  | New York | NY    | 10001 |
| 33333   | 333 Main St | # 3  | New York | NY    | 10001 |
| 44444   | 444 Main St | # 4  | New York | NY    | 10001 |

-------------------------------
| StoreNo | Quantity | ItemNo |
| 11111   | 10       | AAAAA  |
| 11111   | 5        | BBBBB  |
| 33333   | 50       | BBBBB  |
| 22222   | 20       | AAAAA  |

查询：列出所有已订购的门店；订购了哪些项目和数量？

$query = "SELECT * FROM STOREINFO ".
    "LEFT JOIN STOREORDER ON STOREINFO.StoreNo = STOREORDER.StoreNo ".
    "LEFT JOIN ITEMINFO ON STOREORDER.ItemNo = ITEMINFO.ItemNo ".
    "ORDER BY STOREINFO.StoreNo ASC";

$result = mysql_query($query) or die(mysql_error());

// Print out the contents of each row into a table 
while($row = mysql_fetch_array($result)){
$CheckStoreNo = trim($row['StoreNo']);
if($CheckStoreNo != "") 
        {
        echo " *print store info* ";
---->>>>    echo " *list ALL item ordered & qty* ";
        }
}
    echo "<hr>";
?>

我设法做到了这一点。现在，如果你注意到商店#11111实际上有两（两）份不同商品的订单。我不需要回显所有重复的公司信息，只需要回显一次相同的公司信息，并列出为商店#11111订购的所有物品

示例：这就是我需要的

Company: Store # 11111
111 Main St, # 1, New York, NY 10001
Tel: 111-111-1111
1) Item: AAAAA - 10 pc(s)
2) Item: BBBBB - 5 pc(s)

Company: Store # 22222
... And so on ...

Company: Store # 11111
111 Main St, # 1, New York, NY 10001
Tel: 111-111-1111
1) Item: AAAAA - 10 pc(s)
2) Item: BBBBB - 5 pc(s)
------- End of order for Store # 11111 -----

Company: Store # 22222
... List order ...
------- End of order for Store # 22222 -----

我根据每家商店的订单列出了所有订单。（感谢@cularis）

现在，在每家商店下单后，我如何关闭/结束它

示例：关闭每家店铺的订单以便打印

Company: Store # 11111
111 Main St, # 1, New York, NY 10001
Tel: 111-111-1111
1) Item: AAAAA - 10 pc(s)
2) Item: BBBBB - 5 pc(s)

Company: Store # 22222
... And so on ...

Company: Store # 11111
111 Main St, # 1, New York, NY 10001
Tel: 111-111-1111
1) Item: AAAAA - 10 pc(s)
2) Item: BBBBB - 5 pc(s)
------- End of order for Store # 11111 -----

Company: Store # 22222
... List order ...
------- End of order for Store # 22222 -----

---

这不是MySQL，而是一个PHP问题

您必须在前端这样做：

// Print out the contents of each row into a table 
$OldStoreNo = ""
while($row = mysql_fetch_array($result)){
$CheckStoreNo = trim($row['StoreNo']);
if($CheckStoreNo != "") {
    if($OldStoreNo != $CheckStoreNo) {
        echo " *print store info* ";
        $OldStoreNo = $CheckStoreNo;
    }
    echo " *list item ordered & qty* ";
  }
}

---

与OldStoreNo一起，您可以跟踪每个门店的当前商品数量，以便在每个商品旁边输出一个数字。

在while循环中跟踪门店编号 如果与上一个相同，则打印订单，否则打印storeinfo和订单

//track store_no
$current_store_no = false;

while($row = mysql_fetch_array($result)){
    if (trim($row['StoreNo']) != $current_store_no) {
        //print store info
        $current_store_no = trim($row['StoreNo'])
    }
    //print order info
}

---

一切都很好！多谢各位=D下一个问题：在列出每个商店的所有商品（用于向每个商店打印）后，如何关闭它？在打印下一个商店的店铺信息之前，请打印上一个商店之后的所有信息。您必须检查它是否是第一个带有布尔值的存储，因为这样您就不想打印店铺结束信息。如果（$CurrentStoneNo！=$CheckStoreNo和$numcount>0）{print-end-ORDER}，我会在“$CheckStoreNo=trim（$row['StoreNo']）；”之后插入if语句。我不认为这是正确的方法（它无法关闭“上次订单”。请建议=（您必须在while循环结束后最后打印一次门店信息）。