Select 列为 Oracle SQL 中的列

Question

I would like to append a few rows to an already existing table (15 rows to be precise). What is the quickest way to do this?

This works, but it seems redundant.

select person_id from people_table
union all
select '0010' as person_id from dual
union all
select '0019' as person_id from dual
union all
select '0085' as person_id from dual

I was wondering if there's a solution along the lines of:

select person_id from people_table
union all
select ('0010','0019','0085') as person_id from dual

Please note that I want to preserve the leading zeros for each element in my list. This post is almost what I'm looking for , but it converts each element to integers and drops the leading zeros.

Answer 1

You need to use the hiearchy query as follows:

select person_id from people_table
union all
select regexp_substr('0010,0019,0085','[^,]+',1,level) 
  from dual
connect by  level <= length (regexp_replace('0010,0019,0085', '[^,]+'))  + 1 ;

Answer 2

Please use below query using regular expression,

select person_id from people_table
union all
select distinct  trim(regexp_substr(('0010,0019,0085'),'[^,]+', 1, level) ) as person_id
 from dual
 connect by regexp_substr(('0010,0019,0085'), '[^,]+', 1, level)
 order by level;

Answer 3

You can use a system-provided collection type; you select from it using the TABLE operator (even that is no longer necessary since Oracle 12, as I demonstrate below). Note that the column name is COLUMN_NAME - that is the name Oracle chose when they created the system-provided type.

Let's create a small table for testing:

create table people_table (person_id varchar2(10), person_name varchar2(10));

insert into people_table (person_id, person_name) values ('2003', 'Maria');
insert into people_table (person_id, person_name) values ('2005', 'Peter');

Then, here is how you can do what you wanted:

select person_id from people_table
union all
select column_value from sys.odcivarchar2list('1000', '1001', '1002')
;

PERSON_ID
---------
2005
2003
1000
1001
1002

Do a Google search for SYS.ODCIVARCHAR2LIST (and similar SYS.ODCINUMBERLIST ) if you are not familiar with it; it's quite useful.