在Code Igniter中编写子查询

Question

Hello everyone i need a help for writing subqueries on Code Igniter i always fail if i'm using db active record.

Queries that i want to run is

select ( alias_a.field_a + alias_b.field_b ) as total_a from
( select sum(field_a) as TOTAL_SUM, status, date from table_a
where status ='ok'
group by year(date)) as alias_a ,

(select sum(field_b) as total_b, status, date from
table_b where
status = 'good' group by year(date)) as alias_b

where year(alias_a.date) = year(alias_b.date)

this queries has run on sql editor

i have tried $this->db->query('my query') but it has error

any info will helping me so much. Thanks ! :)

Answer 1

Hi please check quotation marks in CI. could you post the exact code implemented in CI query as is so we could see the problem.

thanks ( =