如何更改表复合主键

Question

CREATE TABLE [dbo].[INVS_ITEM_LOCATIONS]
([DEPARTMENT_CODE] [varchar](3) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL,
 [IM_INV_NO] [numeric](10, 0) NOT NULL,
 [LOCATION_CODE] [varchar](2) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL,
 [CURR_QTY] [numeric](10, 0) NOT NULL CONSTRAINT [DF__INVS_ITEM__CURR___1352D76D]  DEFAULT ((0)),
 [DO_QTY] [numeric](10, 0) NOT NULL CONSTRAINT [DF__INVS_ITEM__DO_QT__1446FBA6]  DEFAULT ((0)),
 [ALLOC_QTY] [numeric](10, 0) NOT NULL CONSTRAINT [DF__INVS_ITEM__ALLOC__153B1FDF]  DEFAULT ((0)),
 [YOB_QTY] [numeric](10, 0) NOT NULL CONSTRAINT [DF__INVS_ITEM__YOB_Q__162F4418]  DEFAULT ((0)),
 [FOC_QTY] [numeric](10, 0) NULL CONSTRAINT [DF__INVS_ITEM__FOC_Q__17236851]  DEFAULT ((0)),
 [USER_CREATED] [varchar](25) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL,
 [DATE_CREATED] [datetime] NOT NULL,
 [USER_MODIFIED] [varchar](25) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
 [DATE_MODIFIED] [datetime] NULL,

 CONSTRAINT [INVS_ITEM_LOCATIONS_PK] 
 PRIMARY KEY CLUSTERED ([DEPARTMENT_CODE] ASC,
 [IM_INV_NO] ASC, [LOCATION_CODE] ASC)
 WITH (IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]

这是我的表结构......我如何删除表中的复合主键，并且我应该将外键添加到 im_inv_no 引用表是 invs_location 包含 im_inv_no 并且部门代码应该是相同的主键.pls help

Answer 1

要删除复合主键，请使用：

ALTER TABLE dbo.INVS_ITEM_LOCATIONS
  DROP CONSTRAINT INVS_ITEM_LOCATIONS_PK

要添加外键，请使用：

ALTER TABLE dbo.INVS_ITEM_LOCATIONS
  ADD CONSTRAINT FK_INV_NO_REFERENCE
  FOREIGN KEY(IM_INV_NO, DEPARTMENT_CODE)
  REFERENCES dbo.invs_location(IM_INV_NO, DEPARTMENT_CODE)

这些都是非常基本的初学者 SQL 问题 - 我强烈建议您先阅读各种优秀的 SQL 教程之一以习惯 SQL，然后再在这里发布每个小问题......

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