Question

I have my database segmented in 8 parts, where each part contains database with table user_data, for better search performance im using sphinx to index all those data but im come accross one problem … since table user_data dont have any unique field to represent each row but its a 1 to many table i have trouble to run my sphinx index correctly since it requires unique id and this way resolve in duplicate ids … any idea how can i workaround this? or generate unique id throught all sub indexes from different segments?

example:

SELECT user_id, item_id, info
FROM user_data

Which returns something like:

+----------+-----------------------+
| user_id  | item_id    | info     |
+----------+-----------------------+
| 10       | 151        | asdf     |
| 10       | 152        | test     |
| 11       | 151        | 545      |
| 12       | 151        | sdfsd    |
| 12       | 152        | eewwe    |
| 12       | 153        | dfsd     |

but i have to get

+----------+-----------------------------+
| user_id  | item_id    | info     | id  |
+----------+-----------------------------+
| 10       | 151        | asdf     | 1   |
| 10       | 152        | test     | 2   |
| 11       | 151        | 545      | 3   |
| 12       | 151        | sdfsd    | 4   |
| 12       | 152        | eewwe    | 5   |
| 12       | 153        | dfsd     | 6   |

of course id must be unique throght all segments

Answer 1

first of all you should set before action query to set your variable

sql_query_pre = SET @a := 1;

then use this variable to get fictional auto increment

sql_query = SELECT @a := @a + 1 AS id, user_id, item_id, info FROM user_data