左连接不适用于t-sql

Question

我有一个包含类别的查找表和另一个包含详细信息的表，我试图通过左连接从查找表中获取所有内容，但我仍然只获得匹配的内容。以下是查询 -

select billing_medical_category_name,* 
from billing_medical_category bmc
        --left join UDW.billing_medical_claim_detail BMRPS  WITH ( NOLOCK ) ON bmc.billing_medical_category_id = bmrps.billing_medical_category_id 
        --where bmrps.customer_segment_number = 00744257
        --and cem_load_date > '01-03-2018'
        --order by bmc.billing_medical_category_id