Question

我的数据库中有以下表格。

CREATE TABLE IF NOT EXISTS `client` (
  `CARD_NO` varchar(15) NOT NULL,
  `F_NAME` varchar(20) NOT NULL,
  `L_NAME` varchar(20) NOT NULL,
  `SEX` varchar(5) NOT NULL,
  `DOB` date NOT NULL,
  `SUBCITY` varchar(10) NOT NULL,
  `KEBELE` varchar(5) NOT NULL,
  `HOUSE_NO` varchar(10) NOT NULL,
  `TEL_NO` int(10) DEFAULT NULL,
  `REGION_NO` varchar(10) DEFAULT NULL,
  PRIMARY KEY (`CARD_NO`),
  KEY `REGION_NO` (`REGION_NO`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

--
-- Dumping data for table `client`
--

INSERT INTO `client` (`CARD_NO`, `F_NAME`, `L_NAME`, `SEX`, `DOB`, `SUBCITY`, `KEBELE`, `HOUSE_NO`, `TEL_NO`, `REGION_NO`) VALUES
('1', '', '', 'male', '0000-00-00', '', '', '', NULL, '01'),
('2', '', '', 'male', '0000-00-00', '', '', '', NULL, '02'),
('3', '', '', 'femal', '0000-00-00', '', '', '', NULL, '03'),
('4', '', '', 'femal', '0000-00-00', '', '', '', NULL, '04'),
('5', '', '', 'male', '0000-00-00', '', '', '', NULL, '05'),
('6', '', '', 'male', '0000-00-00', '', '', '', NULL, '05');

-- --------------------------------------------------------

--
-- Table structure for table `non_pregnant`
--

CREATE TABLE IF NOT EXISTS `non_pregnant` (
  `VCT_CODE` varchar(15) NOT NULL,
  `CARD_NO` varchar(15) DEFAULT NULL,
  `RISK_OF_HIV` varchar(30) NOT NULL,
  `PURPOSE` varchar(10) NOT NULL,
  PRIMARY KEY (`VCT_CODE`),
  KEY `CARD_NO` (`CARD_NO`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

--
-- Dumping data for table `non_pregnant`
--

INSERT INTO `non_pregnant` (`VCT_CODE`, `CARD_NO`, `RISK_OF_HIV`, `PURPOSE`) VALUES
('1', '1', '', ''),
('2', '2', '', ''),
('3', '3', '', ''),
('4', '4', '', ''),
('5', '5', '', ''),
('6', '6', '', '');

-- --------------------------------------------------------

--
-- Table structure for table `non_pregnant_vct`
--

CREATE TABLE IF NOT EXISTS `non_pregnant_vct` (
  `VCT_CODE` varchar(15) NOT NULL DEFAULT '',
  `DATE_TESTED` date DEFAULT NULL,
  `TB_RESULT` varchar(10) NOT NULL,
  `HIV_RESULT` varchar(10) NOT NULL,
  `STD_RESULT` varchar(10) NOT NULL,
  PRIMARY KEY (`VCT_CODE`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

--
-- Dumping data for table `non_pregnant_vct`
--

INSERT INTO `non_pregnant_vct` (`VCT_CODE`, `DATE_TESTED`, `TB_RESULT`, `HIV_RESULT`, `STD_RESULT`) VALUES
('1', NULL, '', 'pos', ''),
('2', NULL, '', 'pos', ''),
('3', NULL, '', 'neg', ''),
('4', NULL, '', 'neg', ''),
('5', NULL, '', 'neg', ''),
('6', NULL, '', 'pos', '');

-- --------------------------------------------------------

--
-- Table structure for table `region`
--

CREATE TABLE IF NOT EXISTS `region` (
  `REGION_NO` varchar(10) NOT NULL,
  `REGION_NAME` varchar(10) NOT NULL,
  PRIMARY KEY (`REGION_NO`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

--
-- Dumping data for table `region`
--

INSERT INTO `region` (`REGION_NO`, `REGION_NAME`) VALUES
('01', 'washington'),
('02', 'newyork'),
('03', 'london'),
('04', 'paris'),
('05', 'burlin');

这是我想要的输出..

区域女男总测试正测试正测试正

这是我试图解决但仍然错误的查询..

SELECT r.region_name, c.sex = 'male' as counting, c.sex = 'femal' as counting, v.hiv_result = 'pos' as MalePos from region r
left join client c
on c.region_no = r.region_no
left join non_pregnant p
on c.card_no = p.card_no
left join non_pregnant_vct v
on p.vct_code = v.vct_code
group by c.region_no;

Answer 1

您对所需输出的描述令人惊讶地不清楚，但我会试一试。试试这个：

SELECT
    r.region_name,
    SUM(c.sex = 'male') as NMale,
    SUM(c.sex = 'femal') as NFemale,
    SUM(v.hiv_result = 'pos') as TotalPos,
    SUM(c.sex = 'male' AND v.hiv_result = 'pos') as MalePos,
    SUM(c.sex = 'femal' AND v.hiv_result = 'pos') as FemalePos
FROM region r
LEFT JOIN client c ON c.region_no = r.region_no
LEFT JOIN non_pregnant p ON c.card_no = p.card_no
LEFT JOIN non_pregnant_vct v ON p.vct_code = v.vct_code
GROUP BY c.region_no

使用查询从mysql表中获取字段的总和

1 个答案: