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  • sql distinct

    ---沒有去除重復的記錄
    select distinct ContractLaborEmployeeUidKey,ContractLaborEndDate from ContractLaborList order by ContractLaborEndDate desc
    
    
    
    select  * from ContractLaborList order by ContractLaborEmployeeUidKey
    
    ---沒有去除重復的記錄
    select * from ContractLaborList where ContractLaborEmployeeUidKey in (select distinct ContractLaborEmployeeUidKey from ContractLaborList)
    order by ContractLaborEndDate desc
    
    --去除ContractLaborEmployeeUidKey重復的記錄
    select * from ContractLaborList where ContractLaborEndDate in( SELECT MAX(ContractLaborEndDate) AS ContractLaborEndDate FROM ContractLaborList GROUP BY ContractLaborEmployeeUidKey) --重复行只查询一条
    order by ContractLaborEndDate desc
    
    ---去除ContractLaborEmployeeUidKey重復的記錄
    select * from ContractLaborList e 
    WHERE e.ContractLaborEndDate = (SELECT max(x.ContractLaborEndDate) FROM ContractLaborList x WHERE x.ContractLaborEmployeeUidKey = e.ContractLaborEmployeeUidKey);
    
    SELECT * FROM View_ContractLaborList
    
    --取出ContractLaborEmployeeUidKey重復的值
    SELECT  * FROM ContractLaborList s2
    WHERE 1 < (SELECT COUNT(*)  FROM ContractLaborList s1 WHERE s1.ContractLaborEmployeeUidKey = s2.ContractLaborEmployeeUidKey)
    
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  • 原文地址:https://www.cnblogs.com/geovindu/p/2748586.html
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