怎么用thinkphp的查询语言构建这样的select查询？ | Dami

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怎么用thinkphp的查询语言构建这样的select查询？

求助如何用thinkphp的查询语言做到下面这样的查询。。

table a (分类表)
id　name
1　l
2　ll
3　lll

table b (内容表)
id　cid　xname
1　2　　x
2　1　　xx
3　2　　xxx
4　1　　xxxxx
5　1　　xxxxxxx


 select a.id,a.name,(select count(id) as counts from b where b.cid=a.id) from a
//查询分类下的项目数，没有的显示0，及分类id，名称

return ：
id　　name　　counts
1　　l　　　　　3
2　　ll　　　　　2
3　　lll　　　　　0

thinkphp php mysql

9 years, 2 months ago

lzcllyt

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lzcllyt 9 years, 2 months ago

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 SELECT a.id, a.name, COUNT(b.id) AS row_number FROM a LEFT JOIN b ON a.id = b.cid GROUP BY a.id;

重点在： GROUP BY a.id

answered 9 years, 2 months ago

scxzcv

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scxzcv answered 9 years, 2 months ago

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//$table['表'] = 别名
$table['a'] = a;//a表
$thble['b'] = b;//b表
$this->Table($table)->Where('b.cid = a.id')->getfield('a.id,a.name,count(b.id) as counts');

answered 9 years, 2 months ago

人间大杯具

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人间大杯具 answered 9 years, 2 months ago

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使用虚拟模型进行多表查询

answered 9 years, 2 months ago

dark9

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dark9 answered 9 years, 2 months ago

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$Model = M('A');
$Model->field('a.id,a.name,count(a.id)')->join('LEFT JOIN B ON A .id = B .cid')->group(a.id)->select();

answered 9 years, 2 months ago

真無口鬼畜執事

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真無口鬼畜執事 answered 9 years, 2 months ago

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