小编Ado*_*rez的帖子

我正在运行以下查询的执行计划：

select m_uid from EmpTaxAudit 
where clientid = 91682 
and  empuid = 42100176452603
and newvalue in('Deleted','DB-Deleted','Added')

下面是执行计划：

我在 ClientId 和 NewValue 列上的 EmpTaxAudit 表上有一个非聚集索引，上面显示为执行的 14.9%：

CREATE NONCLUSTERED INDEX [idx_EmpTaxAudit_clientid_newvalue] ON [dbo].

[EmpTaxAudit]
(
    [ClientID] ASC,
    [NewValue] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, SORT_IN_TEMPDB = OFF, DROP_EXISTING = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON)

我还有一个非聚集唯一索引 PK，如下所示：

ALTER TABLE [dbo].[EmpTaxAudit] ADD  CONSTRAINT [PK_EmpTaxAudit] PRIMARY KEY NONCLUSTERED 
(
    [ClientID] ASC,
    [EmpUID] ASC,
    [m_uid] ASC,
    [m_eff_start_date] ASC,
    [ReplacedOn] …