左連接MySQL的三個表

Question

我有三個表，我想離開加盟而是兩個表可以正常使用，當我加3臺，僅顯示那些在第3表中的記錄

Select `0_debtor_trans_details`.debtor_trans_no As Bill_no, 
    `0_debtor_trans_details`.stock_id As Item, 
    `0_debtor_trans_details`.unit_price As Unit_price, 
    `0_debtor_trans_details`.quantity As Qty, 
    `0_debtor_trans_details`.description, 
    `0_debtor_trans`.debtor_no As Reg_no, 
    `0_debtor_trans`.type As type, 
    `0_debtor_trans`.ov_amount As Total_Amount, 
    `0_debtor_trans`.tran_date As Tran_Date, 
    `0_comments`.memo_ 
From `0_debtor_trans_details` 
    Inner Join `0_debtor_trans` On `0_debtor_trans_details`.debtor_trans_no = 
    `0_debtor_trans`.trans_no 
    Left Join `0_comments` On `0_debtor_trans`.trans_no = `0_comments`.id 
Where `0_debtor_trans`.type = 10 And `0_comments`.type = 10 
Group By `0_debtor_trans_details`.debtor_trans_no, 
    `0_debtor_trans_details`.stock_id, 
    `0_debtor_trans_details`.unit_price, 
    `0_debtor_trans_details`.quantity, 
    `0_debtor_trans_details`.description, 
    `0_debtor_trans`.debtor_no, 
    `0_debtor_trans`.type, 
    `0_debtor_trans`.ov_amount, 
    `0_debtor_trans`.tran_date, 
    `0_comments`.memo_ 
Having `0_debtor_trans_details`.description = 'Fine'  

當我添加0_comments它只顯示那些在0_comments 如何做到這一點

CREATE TABLE IF NOT EXISTS `0_comments` (
    `type` int(11) NOT NULL DEFAULT '0', 
    `id` int(11) NOT NULL DEFAULT '0', 
    `date_` date DEFAULT '0000-00-00', 
    `memo_` tinytext, 
    KEY `type_and_id` (`type`,`id`) 
) ENGINE=InnoDB DEFAULT CHARSET=latin1; 



CREATE TABLE IF NOT EXISTS `0_debtor_trans` (
    `trans_no` int(11) unsigned NOT NULL DEFAULT '0', 
    `type` smallint(6) unsigned NOT NULL DEFAULT '0', 
    `version` tinyint(1) unsigned NOT NULL DEFAULT '0', 
    `debtor_no` int(11) unsigned DEFAULT NULL, 
    `branch_code` int(11) NOT NULL DEFAULT '-1', 
    `tran_date` date NOT NULL DEFAULT '0000-00-00', 
    `due_date` date NOT NULL DEFAULT '0000-00-00', 
    `reference` varchar(60) NOT NULL DEFAULT '', 
    `tpe` int(11) NOT NULL DEFAULT '0', 
    `order_` int(11) NOT NULL DEFAULT '0', 
    `ov_amount` double NOT NULL DEFAULT '0', 
    `ov_gst` double NOT NULL DEFAULT '0', 
    `ov_freight` double NOT NULL DEFAULT '0', 
    `ov_freight_tax` double NOT NULL DEFAULT '0', 
    `ov_discount` double NOT NULL DEFAULT '0', 
    `alloc` double NOT NULL DEFAULT '0', 
    `rate` double NOT NULL DEFAULT '1', 
    `ship_via` int(11) DEFAULT NULL, 
    `dimension_id` int(11) NOT NULL DEFAULT '0', 
    `dimension2_id` int(11) NOT NULL DEFAULT '0', 
    `payment_terms` int(11) DEFAULT NULL, 
    `Datetime` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP, 
    `deposit` varchar(30) NOT NULL DEFAULT 'Deposit', 
    `payment` varchar(30) NOT NULL DEFAULT 'Payment', 
    `Date` date NOT NULL DEFAULT '0000-00-00', 
    PRIMARY KEY (`type`,`trans_no`), 
    KEY `debtor_no` (`debtor_no`,`branch_code`), 
    KEY `tran_date` (`tran_date`), 
    KEY `ov_amount` (`ov_amount`) 
) ENGINE=InnoDB DEFAULT CHARSET=latin1; 



CREATE TABLE IF NOT EXISTS `0_debtor_trans_details` (
    `id` int(11) NOT NULL AUTO_INCREMENT, 
    `debtor_trans_no` int(11) DEFAULT NULL, 
    `debtor_trans_type` int(11) DEFAULT NULL, 
    `stock_id` varchar(20) NOT NULL DEFAULT '', 
    `description` tinytext, 
    `unit_price` double NOT NULL DEFAULT '0', 
    `unit_tax` double NOT NULL DEFAULT '0', 
    `quantity` double NOT NULL DEFAULT '0', 
    `discount_percent` double NOT NULL DEFAULT '0', 
    `standard_cost` double NOT NULL DEFAULT '0', 
    `qty_done` double NOT NULL DEFAULT '0', 
    `src_id` int(11) NOT NULL, 
    PRIMARY KEY (`id`), 
    KEY `Transaction` (`debtor_trans_type`,`debtor_trans_no`), 
    KEY `src_id` (`src_id`) 
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=12523 ; 

Answer 1

也許這就是你追求的記錄...

SELECT DISTINCT d.debtor_trans_no Bill_no 
       , d.stock_id Item 
       , d.unit_price Unit_price 
       , d.quantity Qty 
       , d.description 
       , t.debtor_no Reg_no 
       , t.type 
       , t.ov_amount Total_Amount 
       , t.tran_date Tran_Date 
       , c.memo_ 
      FROM `0_debtor_trans_details` d 
      JOIN `0_debtor_trans` t 
      ON t.trans_no = d.debtor_trans_no 
      JOIN `0_comments` c 
      ON c.id = t.trans_no 
      WHERE t.type = 10 
      AND c.type = 10 
      AND d.description = 'Fine' 
      ORDER 
      BY d.debtor_trans_no 
       , d.stock_id 
       , d.unit_price 
       , d.quantity 
       , d.description 
       , t.debtor_no 
       , t.type 
       , t.ov_amount 
       , t.tran_date 
       , c.memo_;