Sql 连接不同大小的数字列
Sql 连接不同大小的数字列,sql,oracle,Sql,Oracle,表1的类型。mycolumn是编号（10），表2的类型是是编号（6）。我该怎么做才能加入他们而不被Oracle抛出错误？为什么您认为会出现错误？你试过了吗 SELECT * FROM table1 JOIN table2 ON table1.mycolumn = table2.mycolumn 你为什么认为你会出错？你试过了吗 SELECT * FROM table1 JOIN table2 ON table1.mycolumn = table2.mycolumn 执行此操作时没有错
表1的类型。mycolumn编号（10）是编号（6）
。我该怎么做才能加入他们而不被Oracle抛出错误？为什么您认为会出现错误？你试过了吗
SELECT *
FROM table1
JOIN table2 ON table1.mycolumn = table2.mycolumn
你为什么认为你会出错？你试过了吗
SELECT *
FROM table1
JOIN table2 ON table1.mycolumn = table2.mycolumn
执行此操作时没有错误：
Oracle 11g R2架构设置：
create table t1 (col1 number(10));
create table t2 (col1 number(6));
insert into t1
select 1000000001 col1 from dual union all
select 1111111 col1 from dual union all
select 1 col1 from dual;
insert into t2
select 111111 col1 from dual union all
select 1 col1 from dual;
commit;
select *
from t1 inner join t2 on (t1.col1 = t2.col1);
COL1 COL1_1
---------- ----------
1 1
CREATE TABLE table_a (
num_a NUMBER(6)
);
CREATE TABLE table_b (
num_b NUMBER(10)
);
INSERT INTO table_a VALUES ( 123456 );
INSERT INTO table_b VALUES ( 123456 );
INSERT INTO table_b VALUES ( 1234567890 );
select *
from table_a a
join table_b b
on a.num_a = b.num_b
查询1：
create table t1 (col1 number(10));
create table t2 (col1 number(6));
insert into t1
select 1000000001 col1 from dual union all
select 1111111 col1 from dual union all
select 1 col1 from dual;
insert into t2
select 111111 col1 from dual union all
select 1 col1 from dual;
commit;
select *
from t1 inner join t2 on (t1.col1 = t2.col1);
COL1 COL1_1
---------- ----------
1 1
CREATE TABLE table_a (
num_a NUMBER(6)
);
CREATE TABLE table_b (
num_b NUMBER(10)
);
INSERT INTO table_a VALUES ( 123456 );
INSERT INTO table_b VALUES ( 123456 );
INSERT INTO table_b VALUES ( 1234567890 );
select *
from table_a a
join table_b b
on a.num_a = b.num_b
：
create table t1 (col1 number(10));
create table t2 (col1 number(6));
insert into t1
select 1000000001 col1 from dual union all
select 1111111 col1 from dual union all
select 1 col1 from dual;
insert into t2
select 111111 col1 from dual union all
select 1 col1 from dual;
commit;
select *
from t1 inner join t2 on (t1.col1 = t2.col1);
COL1 COL1_1
---------- ----------
1 1
CREATE TABLE table_a (
num_a NUMBER(6)
);
CREATE TABLE table_b (
num_b NUMBER(10)
);
INSERT INTO table_a VALUES ( 123456 );
INSERT INTO table_b VALUES ( 123456 );
INSERT INTO table_b VALUES ( 1234567890 );
select *
from table_a a
join table_b b
on a.num_a = b.num_b
执行此操作时没有错误：
Oracle 11g R2架构设置：
create table t1 (col1 number(10));
create table t2 (col1 number(6));
insert into t1
select 1000000001 col1 from dual union all
select 1111111 col1 from dual union all
select 1 col1 from dual;
insert into t2
select 111111 col1 from dual union all
select 1 col1 from dual;
commit;
select *
from t1 inner join t2 on (t1.col1 = t2.col1);
COL1 COL1_1
---------- ----------
1 1
CREATE TABLE table_a (
num_a NUMBER(6)
);
CREATE TABLE table_b (
num_b NUMBER(10)
);
INSERT INTO table_a VALUES ( 123456 );
INSERT INTO table_b VALUES ( 123456 );
INSERT INTO table_b VALUES ( 1234567890 );
select *
from table_a a
join table_b b
on a.num_a = b.num_b
查询1：
create table t1 (col1 number(10));
create table t2 (col1 number(6));
insert into t1
select 1000000001 col1 from dual union all
select 1111111 col1 from dual union all
select 1 col1 from dual;
insert into t2
select 111111 col1 from dual union all
select 1 col1 from dual;
commit;
select *
from t1 inner join t2 on (t1.col1 = t2.col1);
COL1 COL1_1
---------- ----------
1 1
CREATE TABLE table_a (
num_a NUMBER(6)
);
CREATE TABLE table_b (
num_b NUMBER(10)
);
INSERT INTO table_a VALUES ( 123456 );
INSERT INTO table_b VALUES ( 123456 );
INSERT INTO table_b VALUES ( 1234567890 );
select *
from table_a a
join table_b b
on a.num_a = b.num_b
：
create table t1 (col1 number(10));
create table t2 (col1 number(6));
insert into t1
select 1000000001 col1 from dual union all
select 1111111 col1 from dual union all
select 1 col1 from dual;
insert into t2
select 111111 col1 from dual union all
select 1 col1 from dual;
commit;
select *
from t1 inner join t2 on (t1.col1 = t2.col1);
COL1 COL1_1
---------- ----------
1 1
CREATE TABLE table_a (
num_a NUMBER(6)
);
CREATE TABLE table_b (
num_b NUMBER(10)
);
INSERT INTO table_a VALUES ( 123456 );
INSERT INTO table_b VALUES ( 123456 );
INSERT INTO table_b VALUES ( 1234567890 );
select *
from table_a a
join table_b b
on a.num_a = b.num_b
我的意思是，如果不执行更改数据定义的操作，只需将它们连接起来，就无需执行任何操作。我希望@ughai所说的是CAST（）
，如：CAST（table2.mycolumn number（10））
。但我认为这与本案无关。假设table1.mycolumn=table2.column
是一个打字错误，您的意思是table1.mycolumn=table2.mycolumn
，也就是说，您可以将mycolumn从table1分为长度6，但这不能保证您会得到正确的结果，并且将数字值6+长度转换为6将导致ORA-01438），因此只有substrI的意思是，如果不执行更改数据定义的操作，只需加入它们，就无需执行任何操作。我希望@ughai所说的是CAST（）
，如：CAST（table2.mycolumn number（10））
。但我认为这与本案无关。假设table1.mycolumn=table2.column
是一个打字错误，您的意思是table1.mycolumn=table2.mycolumn
，也就是说，您可以将mycolumn从table1子串到长度6，但这不能保证您会得到正确的结果，并且将6+长度的数值强制转换为6会导致ORA-01438），因此只有substr