[英]Alternative to REGEXP_LIKE in oracle
Can you please tell me if there is any alternative function which I can use for REGEXP_LIKE ? 您能否告诉我REGEXP_LIKE是否可以使用其他功能?
I have the following situation: 我有以下情况:
Names:
ID NAME
1 Alex
2 Jim
3 Tom
Invoices:
ID Amount Name_IDs
1 100 1;2;
2 200 2;3;
Wanted output:
Invoice_ID Names Amount:
1 Alex;Jim; 100
2 Jim;Tom; 200
I know that the database model is not quite technically right, but now I'm using a query for this with REGEXP_LIKE to add in a listagg() the names, but the performance is very very slow. 我知道数据库模型在技术上不是很正确,但是现在我正在使用REGEXP_LIKE对此查询,以在listagg()中添加名称,但是性能非常慢。
SELECT inv.id as invoice_id,
SELECT listagg(n.name,';') WITHIN GROUP (ORDER BY NULL) from names where REGEXP_LIKE(inv.names, '(^|\W)' || n.name || '(\W|$) 'as names
inv.amount as amount
from invoices inv;
Can you please give me any idea how to improve this query ? 您能给我任何想法如何改进此查询吗?
Thank you! 谢谢!
If you have an index on your names
table then this should be faster: 如果您的
names
表上有索引,那么它应该更快:
select i.id,
i.amount,
(select listagg(n.name, ';') within group(order by null)
from (select trim(regexp_substr(str, '[^;]+', 1, level)) ASPLIT
from (select i.name_ids as str from dual)
connect by regexp_substr(str, '[^;]+', 1, level) is not null) t
join names n
on n.id = t.asplit)
from invoices i;
ie first split by Name_IDs
and join with the names
table. 即首先按
Name_IDs
分割,然后与names
表Name_IDs
。
I suggest that you change your data model to something like the following: 我建议您将数据模型更改为以下内容:
NAMES:
ID_NAMES NAME
10 Alex
20 Jim
30 Tom
INVOICES:
ID_INVOICE Amount
1 100
2 200
INVOICE_NAMES:
ID_INVOICE ID_NAME
1 10
1 20
2 20
2 30
Best of luck. 祝你好运。
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