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

lzcllyt 9 years, 10 months ago

 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

scxzcv answered 9 years, 10 months ago

//$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');

人间大杯具 answered 9 years, 10 months ago

使用虚拟模型 进行多表查询

dark9 answered 9 years, 10 months ago

$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();

真無口鬼畜執事 answered 9 years, 10 months ago

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