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create table elms_leads(phone_voice varchar(20), phone_work varchar(20), phone_cell varchar(20));
insert into elms_leads values('0000000','0000000000','1234567890'); insert into elms_leads values('','__________','1234567890');
2 rows affected
select CASE WHEN TRY_CAST(elms_leads.phone_voice AS INT) > 0 and len(elms_leads.phone_voice) in (7,10) and cast(elms_leads.phone_voice AS INT) > 0 THEN elms_leads.phone_voice WHEN TRY_CAST(elms_leads.phone_work AS INT) > 0 and len(elms_leads.phone_work) in (7,10) and cast(elms_leads.phone_work AS INT) > 0 THEN elms_leads.phone_work WHEN TRY_CAST(elms_leads.phone_cell AS INT) > 0 and len(elms_leads.phone_cell) in (7,10) and cast(elms_leads.phone_cell AS INT) > 0 THEN elms_leads.phone_cell ELSE '' END AS phone1 from elms_leads
phone1
1234567890
1234567890