Question

嗨，请帮帮我我有一个包含大量表格的数据库。我必须从整个数据库中删除所有记录（除了10个给定的studentID），其中studentId不在给定的10个ID中。 studentID是表中的主键和许多表中的外键。我不确定即使其他表可能具有相同的studentID，现在我想编写一个脚本来执行此任务，这将删除父表和子表（sql server 2008）中的所有记录。

Answer 1

对于外键约束，您必须首先从子表中执行删除。

这将是这样的，因为你已经有了StudentIDs，所以不需要连接到父表。

Delete child1 Where studentID not in (1,2,4,5,6,77,122,123,1222,12121,99999)
Delete child2 Where studentID not in (1,2,4,5,6,77,122,123,1222,12121,99999)
Delete child3 Where studentID not in (1,2,4,5,6,77,122,123,1222,12121,99999)
Delete students Where studentID not in (1,2,4,5,6,77,122,123,1222,12121,99999)

如果你有一个“孙子”表，例如学生 - ＆gt;帐户 - ＆gt; AccountHistory，然后你会以相反的顺序删除，例如：

Delete AccountHitory
where AccountID not in (
    select AccountID
    From Account
    Where studentID in (1,2,4,5,6,77,122,123,1222,12121,99999))

Delete Account Where studentID not in (1,2,4,5,6,77,122,123,1222,12121,99999)

Delete Student Where studentID not in (1,2,4,5,6,77,122,123,1222,12121,99999)

<小时/> 要查找外键链接的层次结构，可以使用此查询

示例表

create table student (studentid int identity primary key)
create table student_class (id int primary key, studentid int references student(studentid))
create table student_class_attendance (student_classid int references student_class(id), attended datetime)
create table invoice (id int primary key, studentid int references student(studentid), due datetime, amount money)

查询查找链接表

;with tmp(lvl,FK,PK) As (
    SELECT 1, FK.TABLE_NAME, PK.TABLE_NAME
    FROM INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS C 
    INNER JOIN INFORMATION_SCHEMA.TABLE_CONSTRAINTS FK ON C.CONSTRAINT_NAME = FK.CONSTRAINT_NAME 
    INNER JOIN INFORMATION_SCHEMA.TABLE_CONSTRAINTS PK ON C.UNIQUE_CONSTRAINT_NAME = PK.CONSTRAINT_NAME 
    WHERE PK.TABLE_NAME = 'student'
    UNION ALL
    SELECT lvl+1, FK.TABLE_NAME, PK.TABLE_NAME
    FROM INFORMATION_SCHEMA.REFERENTIAL_CONSTRAINTS C 
    INNER JOIN INFORMATION_SCHEMA.TABLE_CONSTRAINTS FK ON C.CONSTRAINT_NAME = FK.CONSTRAINT_NAME 
    INNER JOIN INFORMATION_SCHEMA.TABLE_CONSTRAINTS PK ON C.UNIQUE_CONSTRAINT_NAME = PK.CONSTRAINT_NAME 
    INNER JOIN tmp on tmp.FK = PK.TABLE_NAME
)
SELECT *
FROM tmp
order by lvl desc

从数据库中删除记录

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