sqlserver 左连接的写法

概述select a.req_id,a.port_in_did,a.acctid,a.status,a.country,a.port_in_provider,b.calling_plan_name,c.filetype,a.first_name,a.last_name,a.street_number,a.street_number_suffix,a.pre_directional,a.street

select a.req_ID,a.port_in_dID,a.acctID,a.status,a.country,a.port_in_provIDer,b.calling_plan_name,c.filetype,a.first_name,a.last_name,a.street_number,a.street_number_suffix,a.pre_directional,a.street_name,a.street_suffix,a.post_directional,a.secondary_location_description,a.unit,a.city,a.state,a.zip,a.zip4 from bb_DID_PORT_IN_REQUEST a,bb_nextone_calling_plan b,bb_dID_port_in_upload c where a.port_in_provIDer=b.server_group_ID and a.acctID*=c.acctID and port_in_dID = '2012259193'old------------------------------------newselect a.req_ID,a.zip4from bb_DID_PORT_IN_REQUEST a left join bb_dID_port_in_upload c on a.acctID=c.acctID  inner join bb_nextone_calling_plan b on  a.port_in_provIDer=b.server_group_IDwhere  port_in_dID = '2012259193'

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