在Oracle 12c中的多行上串聯一列

Question

我有一張與Oracle 12c中的舊終端系統的訂單相關的注釋表。 每個訂單參考都有幾行注釋，按序號排序。

我想將每個訂單參考的所有相關注釋連接在一起，以便我可以嘗試從中提取一些地址數據。 地址數據可以分布在幾個不同的序列號上。 結構為：

| SEQ | NOTE_TEXT                | ORDER | ... |
|-----|--------------------------|-------|-----|
| 1   | The address for this     |       |     |
| 2   | is 123 The Street, City, |       |     |
| 3   | County, Postcode         |       |     |
| 1   | This customer has ordered|       |     |
| 2   | this product on date     |       |     |
| 1   | Some other note          |       |     |
| 1   | This order is for A Smith|       |     |
| 2   | The address is 4 The Lane|       |     |
| 3   | City, County, Postcode   |       |     |
------------------------------------------------

我想將其轉換為：

|--------|---------------------------------------------------------------------------|
| ORDER  | NOTE_TEXT                                                                 |
|--------|---------------------------------------------------------------------------|
| ABC123 | The address for this is 123 The Street, City, County, Postcode            |
| DEF456 | This customer has ordered this product on date                            |
| GHI789 | Some other note                                                           |
| JKL012 | This order is for A Smith The address is 4 A Lane, City, County, Postcode |
|--------|---------------------------------------------------------------------------|

在連接之前修剪每個音符行可能會很好，但是我還需要確保在兩行的連接之間放置一個空格，以防萬一有人用文本填充了整個行。 哦，順序不對，所以我也需要先排序。

謝謝你的幫助！

Answer 1

您可以為此使用listagg：

select "order" || listagg(seq, '') within group (order by seq) as "order",
    listagg(trim(note_text), ' ') within group (order by seq) as note_text
from your_table
group by "order";

另外，請注意， order是oracle中的保留關鍵字。 最好使用其他一些標識符或使用"將其轉義。