同步表中的數據

Question

我有一個代碼，現在我需要編寫一個查詢來同步表中的數據。但我不明白，怎麼做。

CREATE TABLE [dbo].[meal1](
    [inc] [int] IDENTITY(3,1) NOT NULL, 
    [name] [varchar](48) NULL, 
    [lname] [varchar](48) NULL, 
    [sort] [int] NULL, 
CONSTRAINT [PK_meal] PRIMARY KEY CLUSTERED 
(
    [inc] ASC 
) 
) ON [PRIMARY] 

CREATE TABLE [dbo].[meal2](
    [inc] [int] IDENTITY(3,1) NOT NULL, 
    [name] [varchar](48) NULL, 
    [lname] [varchar](48) NULL, 
    [sort] [int] NULL, 
CONSTRAINT [PK_meal] PRIMARY KEY CLUSTERED 
(
    [inc] ASC 
) 
) ON [PRIMARY] 


insert into meal1 (incdec, name, lname) 
    values (4,'BB','BB') 
insert into meal1 (incdec, name, lname) 
    values (6,'FB','FB') 
insert into meal1 (incdec, name, lname) 
    values (7,'AI','AI') 

insert into meal2 (incdec, name, lname) 
    values (8,'UAI','UAI') 
insert into meal2 (incdec, name, lname) 
    values (9,'AI ELEGANCE','AI ELEGANCE') 
insert into meal2 (incdec, name, lname) 
    values (10,'IM','IM') 
insert into meal2 (incdec, name, lname) 
    values (11,'HB','HB') 
insert into meal2 (incdec, name, lname) 
    values (13,'HA/I','HA/I') 

Answer 1

SQL存在很多問題。您正在插入一個不存在incdec的列 - 列名是inc。但是，您不需要插入此列 - 因爲它會自動遞增 - 列被定義爲IDENTITY列。

主鍵的名稱必須是唯一的 - 所以我改名爲第二表的主鍵，PK_meal2

這裏是固定的SQL。我已經測試過它，它的工作原理如下：

CREATE TABLE [dbo].[meal1](
    [inc] [int] IDENTITY(3,1) NOT NULL, 
    [name] [varchar](48) NULL, 
    [lname] [varchar](48) NULL, 
    [sort] [int] NULL, 
CONSTRAINT [PK_meal] PRIMARY KEY CLUSTERED 
(
    [inc] ASC 
) 
) ON [PRIMARY] 

CREATE TABLE [dbo].[meal2](
    [inc] [int] IDENTITY(3,1) NOT NULL, 
    [name] [varchar](48) NULL, 
    [lname] [varchar](48) NULL, 
    [sort] [int] NULL, 
CONSTRAINT [PK_meal2] PRIMARY KEY CLUSTERED 
(
    [inc] ASC 
) 
) ON [PRIMARY] 


insert into meal1 (name, lname) 
    values ('BB','BB') 
insert into meal1 (name, lname) 
    values ('FB','FB') 
insert into meal1 (name, lname) 
    values ('AI','AI') 

insert into meal2 (name, lname) 
    values ('UAI','UAI') 
insert into meal2 (name, lname) 
    values ('AI ELEGANCE','AI ELEGANCE') 
insert into meal2 (name, lname) 
    values ('IM','IM') 
insert into meal2 (name, lname) 
    values ('HB','HB') 
insert into meal2 (name, lname) 
    values ('HA/I','HA/I')