解析数据库列到个别列

Question

我想解析存储在数据库列中的一些数据到单个列中。数据可能会有所不同。我想为数据库列命名正在分析的值的名称。例如数= 12345的列应被叫号码，该列中的值应为12345

存储在列中的数据的一个例子：

id text 
___________________________________________________________________________ 
1 Re: Fwd: number=12345:bottle=glass:water=sparkling:food=chocolate 
2 number=223344:bottle=plastic:water=still:food=sweets:biscuit=digestive 

我想是这样的：

id Re Fwd number bottle water  food  biscuit 
__________________________________________________________________ 
1 Re Fwd 12345 glass sparkling chocolate null 
2 null null 223344 plastic still  sweets  digestive  

我试过(select string_to_array (text, ':') from my_table)但它分裂的数据，但不是我想要它。

Answer 1

表中插入到：

create table s201 (id int,Re text, Fwd text,number int, bottle text, water text,  food text,  biscuit text); 

查询：

with pre as (
with a(k,v) as (
    values (1,'Re: Fwd: number=12345:bottle=glass:water=sparkling:food=chocolate'),(2,'number=223344:bottle=plastic:water=still:food=sweets:biscuit=digestive') 
) 
    , col(s,n) as (select * from unnest(array['Re','Fwd','number','bottle','water','food','biscuit']) with ordinality c (s,n)) 
select s,n,k, case when o not like '%=%' then trim(o) else split_part(trim(o),'=',2) end c 
from col 
join a on true 
left outer join unnest(string_to_array(a.v,':')) with ordinality t (o,i) on split_part(trim(o),'=',1) = s 
) 
, agg as (
select k, array_agg(c order by n) a 
from pre 
group by k 
) 
insert into s201 
select k,a[1],a[2],a[3]::int,a[4],a[5],a[6],a[7] 
from agg; 

INSERT 0 2

检查：

select * from s201; 
id | re | fwd | number | bottle | water | food | biscuit 
----+----+-----+--------+---------+-----------+-----------+----------- 
    1 | Re | Fwd | 12345 | glass | sparkling | chocolate | 
    2 | |  | 223344 | plastic | still  | sweets | digestive 
(2 rows)