请帮助我.. 我有一个如下的查询： 这是一个表：

1. delivery_order
2. delivery_order_item
3. bst
4. bst_item

我想要显示在delivery_order/item表中存在但在bst/item表中不存在的商品，根据KODE_BARANG和JUMLAH进行比较。

我有下面的查询语句，但是如果数据已经很多的话，它仍然很慢（慢的部分是在比较KODE_BARANG的行）。 我想问一下，我的朋友们是否有类似的情况，并且如何解决？ 提前谢谢，希望这里有人愿意回答。

SELECT
    del.KODE_DO,
    deli.KODE_BARANG,
    deli.NAMA_BARANG,
    deli.JUMLAH,
    deli.SATUAN,
    @DITERIMA := COALESCE ((
        SELECT
            SUM( JUMLAH ) 
        FROM
            bst_item 
        WHERE
            KODE_PENERIMAAN = deli.KODE_DO
            AND KODE_BARANG = deli.KODE_BARANG  #这行使它变慢
            AND `STATUS` <> 0),0) AS DITERIMA,
    COALESCE ( deli.JUMLAH, 0 ) - @DITERIMA AS SISA
FROM
    delivery_order del
    INNER JOIN delivery_order_item deli ON del.KODE_DO = deli.KODE_DO
WHERE
    DATE(del.TANGGAL) >= :TGL1
    AND DATE(del.TANGGAL) <= :TGL2  
    AND COALESCE ( deli.JUMLAH, 0 ) - COALESCE ((
        SELECT
            SUM( JUMLAH ) 
        FROM
            bst_item 
        WHERE
            KODE_PENERIMAAN = deli.KODE_DO
            AND KODE_BARANG = deli.KODE_BARANG  #这行使它变慢
            AND `STATUS` <> 0),0) > 0

SELECT
    del.KODE_DO,
    deli.KODE_BARANG,
    deli.NAMA_BARANG,
    deli.JUMLAH,
    deli.SATUAN,
    @DITERIMA := COALESCE ((
        SELECT
            SUM( JUMLAH ) 
        FROM
            bst_item 
        WHERE
            KODE_PENERIMAAN = deli.KODE_DO
            AND KODE_BARANG = deli.KODE_BARANG  #这行使它变慢
            AND `STATUS` <> 0),0) AS DITERIMA,
    COALESCE ( deli.JUMLAH, 0 ) - @DITERIMA AS SISA
FROM
    delivery_order del
    INNER JOIN delivery_order_item deli ON del.KODE_DO = deli.KODE_DO
WHERE
    DATE(del.TANGGAL) >= :TGL1
    AND DATE(del.TANGGAL) <= :TGL2  
    AND COALESCE ( deli.JUMLAH, 0 ) - COALESCE ((
        SELECT
            SUM( JUMLAH ) 
        FROM
            bst_item 
        WHERE
            KODE_PENERIMAAN = deli.KODE_DO
            AND KODE_BARANG = deli.KODE_BARANG  #这行使它变慢
            AND `STATUS` <> 0),0) > 0