Question

我正在尝试使用内部联接同时从两个表中删除数据。但是，当我尝试运行我的查询时，出现错误

SQL命令未正确结束

错误出来了。

我正在尝试做的简短背景以及表，table1和table2的一些信息。因此两个表都有相同的字段，例如“ABC”。我想使用内连接从两个表中删除数据，但是在表下的字段（XYZ）的where条件下，它等于一个值。

这是我的sql语句：

DELETE table1, table2
FROM table1 
INNER JOIN table1 ON table1.ABC = table2.ABC
WHERE table1.XYZ = 'TESTIT';

Answer 1

您无法删除多个表格。

您必须使用两个不同的DELETE语句。

为此，您可以创建一个临时表来存储要删除的ID，例如：

CREATE TABLE app (ABC varchar(100))

INSERT INTO app (ABC)
SELECT abc
FROM table1
INNER JOIN table1 ON table1.ABC = table2.ABC
WHERE table1.XYZ = 'TESTIT';

DELETE 
FROM table1 
WHERE table1.ABC IN (SELECT ABC FROM app);

DELETE 
FROM table2 
WHERE table2.ABC IN (SELECT ABC FROM app);

DROP TABLE app;

Answer 2

在Oracle中，您不能像单个语句中的2个表delete那样DELETE table1 where table1.ABC = (select table2.ABC from table2 WHERE table2.ABC = table1.ABC and table1.XYZ = 'TESTIT');。语法错误。您可以使用如下：

false

Answer 3

PL / SQL解决方案可能是这样的：

declare
    type abc_tt is table of table1.abc%type index by pls_integer;
    l_abc_collection abc_tt;
begin
    select distinct t1.abc bulk collect into l_abc_collection
    from   table1  t1
           join table2 t2 on t2.abc = t1.abc
    where t1.xyz = 'TESTIT';

    dbms_output.put_line('Stored ' || l_abc_collection.count || ' values for processing');

    forall i in 1..l_abc_collection.count
        delete table1 t
        where  t.xyz = 'TESTIT'
        and    t.abc = l_abc_collection(i);

    dbms_output.put_line('Deleted ' || sql%rowcount || ' rows from table1');

    forall i in 1..l_abc_collection.count
        delete table2 t
        where  t.xyz = 'TESTIT'
        and    t.abc = l_abc_collection(i);

    dbms_output.put_line('Deleted ' || sql%rowcount || ' rows from table2');
end;

输出：

Stored 1000 values for processing
Deleted 1000 rows from table1
Deleted 1000 rows from table1

测试设置：

create table table1 (abc, xyz) as
    select rownum, 'TESTIT' from dual connect by rownum <= 1000
    union all
    select rownum, 'OTHER' from dual connect by rownum <= 100;

create table table2 as select * from table1;

删除后，每个表中有100行。我假设我们只想删除xyz = 'TESTIT'的{{1}}，即使abc值对两个表都是通用的。

Answer 4

select distinct table1.ABC into Temptable
FROM table1 
INNER JOIN table1 ON table1.ABC = table2.ABC
WHERE table1.XYZ = 'TESTIT'


delete table1 where ABC in (select ABC from Temptable)
delete table2 where ABC in (select ABC from Temptable)

drop table Temptable

根据一个连接的结果删除两个表

4 个答案: