Php 如何使用连接和多个where条件?
我有一个具有以下结构的db 我的桌子结构是 国家Php 如何使用连接和多个where条件?,php,mysql,join,Php,Mysql,Join,我有一个具有以下结构的db 我的桌子结构是 国家 'id', 'int(11)', '', 'PRI', '', 'auto_increment' 'name', 'varchar(80)', 'YES', '', '', '' 'id', 'int(11)', '', 'PRI', '', 'auto_increment' 'holiday', 'varchar(90)', 'YES', '', '', '' 'same_date', 'tinyint(1)', 'YES', '', '',
'id', 'int(11)', '', 'PRI', '', 'auto_increment'
'name', 'varchar(80)', 'YES', '', '', ''
'id', 'int(11)', '', 'PRI', '', 'auto_increment'
'holiday', 'varchar(90)', 'YES', '', '', ''
'same_date', 'tinyint(1)', 'YES', '', '', ''
'religions', 'varchar(50)', '', '', '', ''
'season', 'enum('Winter','Spring','Summer','Autumn')', '', '', 'Winter', ''
'rate', 'int(2)', '', '', '0', ''
'id', 'int(11)', '', 'PRI', '', 'auto_increment'
'holiday_id', 'int(11)', '', '', '0', ''
'country_id', 'int(11)', '', '', '0', ''
'link', 'varchar(40)', '', '', '', ''
'holiday_id', 'int(11)', 'YES', 'MUL', '', '' // this refers to the holiday_id from holiday_countries table
'year', 'varchar(4)', 'YES', '', '', ''
'date', 'date', '', '', '0000-00-00', ''
假日
'id', 'int(11)', '', 'PRI', '', 'auto_increment'
'name', 'varchar(80)', 'YES', '', '', ''
'id', 'int(11)', '', 'PRI', '', 'auto_increment'
'holiday', 'varchar(90)', 'YES', '', '', ''
'same_date', 'tinyint(1)', 'YES', '', '', ''
'religions', 'varchar(50)', '', '', '', ''
'season', 'enum('Winter','Spring','Summer','Autumn')', '', '', 'Winter', ''
'rate', 'int(2)', '', '', '0', ''
'id', 'int(11)', '', 'PRI', '', 'auto_increment'
'holiday_id', 'int(11)', '', '', '0', ''
'country_id', 'int(11)', '', '', '0', ''
'link', 'varchar(40)', '', '', '', ''
'holiday_id', 'int(11)', 'YES', 'MUL', '', '' // this refers to the holiday_id from holiday_countries table
'year', 'varchar(4)', 'YES', '', '', ''
'date', 'date', '', '', '0000-00-00', ''
度假国家
'id', 'int(11)', '', 'PRI', '', 'auto_increment'
'name', 'varchar(80)', 'YES', '', '', ''
'id', 'int(11)', '', 'PRI', '', 'auto_increment'
'holiday', 'varchar(90)', 'YES', '', '', ''
'same_date', 'tinyint(1)', 'YES', '', '', ''
'religions', 'varchar(50)', '', '', '', ''
'season', 'enum('Winter','Spring','Summer','Autumn')', '', '', 'Winter', ''
'rate', 'int(2)', '', '', '0', ''
'id', 'int(11)', '', 'PRI', '', 'auto_increment'
'holiday_id', 'int(11)', '', '', '0', ''
'country_id', 'int(11)', '', '', '0', ''
'link', 'varchar(40)', '', '', '', ''
'holiday_id', 'int(11)', 'YES', 'MUL', '', '' // this refers to the holiday_id from holiday_countries table
'year', 'varchar(4)', 'YES', '', '', ''
'date', 'date', '', '', '0000-00-00', ''
假日日期
'id', 'int(11)', '', 'PRI', '', 'auto_increment'
'name', 'varchar(80)', 'YES', '', '', ''
'id', 'int(11)', '', 'PRI', '', 'auto_increment'
'holiday', 'varchar(90)', 'YES', '', '', ''
'same_date', 'tinyint(1)', 'YES', '', '', ''
'religions', 'varchar(50)', '', '', '', ''
'season', 'enum('Winter','Spring','Summer','Autumn')', '', '', 'Winter', ''
'rate', 'int(2)', '', '', '0', ''
'id', 'int(11)', '', 'PRI', '', 'auto_increment'
'holiday_id', 'int(11)', '', '', '0', ''
'country_id', 'int(11)', '', '', '0', ''
'link', 'varchar(40)', '', '', '', ''
'holiday_id', 'int(11)', 'YES', 'MUL', '', '' // this refers to the holiday_id from holiday_countries table
'year', 'varchar(4)', 'YES', '', '', ''
'date', 'date', '', '', '0000-00-00', ''
我使用下面的查询来获取特定国家和特定年份的假期
select hd.holiday_id
, h.same_date
, h.holiday
, hd.date
from holidays as h
join holiday_countries as hc on hc.holiday_id = h.id
join holiday_dates as hd on hd.holiday_id = hc.id
join countries as c on hc.country_id = c.id
where c.name='india'
and hd.year='2010'
示例输出如下所示
975, 1, 'Republic Day', '2010-01-26'
976, , 'India Independence Day', '2010-08-15'
977, 1, 'Gandhi Jayanti (Mahatma Gandhi birthday)', '2010-10-02'
id same_date holiday 2010 2011 2012
975 1 'Republic Day' '2010-01-26' '2011-02-29' '2012-03-26'
976 0 'India Independence Day' '2010-08-15' '2011-08-15' '2012-08-15'
977 1 'Gandhi Jayanti' '2010-10-02' '2011-10-02' '2012-10-02'
但我需要再列出两年的日期,预期的产出是这样的
975, 1, 'Republic Day', '2010-01-26'
976, , 'India Independence Day', '2010-08-15'
977, 1, 'Gandhi Jayanti (Mahatma Gandhi birthday)', '2010-10-02'
id same_date holiday 2010 2011 2012
975 1 'Republic Day' '2010-01-26' '2011-02-29' '2012-03-26'
976 0 'India Independence Day' '2010-08-15' '2011-08-15' '2012-08-15'
977 1 'Gandhi Jayanti' '2010-10-02' '2011-10-02' '2012-10-02'
我怎么能对此提出质疑
SELECT h.same_date,
h.holiday,
hd2010.date,
hd2011.date,
hd2012.date
FROM countries c
JOIN holiday_countries hc
ON hc.country_id = c.id
JOIN holidays h
ON h.id = hc.holiday_id
LEFT JOIN
holiday_dates hd2010
ON hd2010.holiday_id = hc.holiday_id
AND hd2010.year = '2010'
LEFT JOIN
holiday_dates hd2011
ON hd2011.holiday_id = hc.holiday_id
AND hd2011.year = '2011'
LEFT JOIN
holiday_dates hd2012
ON hd2012.holiday_id = hc.holiday_id
AND hd2012.year = '2012'
WHERE c.name = 'india'