場景:
如有這樣一張表,存在字段BSM(標識碼),按照某項規定(GB 國標),此字段必須唯一,現在簡單的來檢索是否存在重複數據。
基本格式:
select 列名, count(*) as CFCS from 表名 group by 列名 having count(列名)>1
實測:
select BSM, count(*) as CFCS from CBDKXX group by BSM having count(BSM)>1
場景:
如有這樣一張表,存在字段BSM(標識碼),按照某項規定(GB 國標),此字段必須唯一,現在簡單的來檢索是否存在重複數據。
基本格式:
select 列名, count(*) as CFCS from 表名 group by 列名 having count(列名)>1
實測:
select BSM, count(*) as CFCS from CBDKXX group by BSM having count(BSM)>1