Mysql to sqlite conversion trouble

[Guest]

I have been converting mysql to sqlite and for basic queries have had good success but I ran across this one I can figure out how to convert its a bit over my head can someone help

SELECT a.key, a.data, a.date_added FROM ((SELECT ('customer_' || ca.key) AS `key`, ca.data, ca.date_added FROM `customer_activity` ca) UNION (SELECT ('affiliate_' || aa.key) AS `key`, aa.data, aa.date_added FROM `affiliate_activity` aa)) a ORDER BY a.date_added DESC LIMIT 0,5

I get this error

 

Query Error: near "UNION": syntax error Unable to execute statement

 

Thanks

[Barand]

Perhaps it is suffering from a surfeit of parentheses.

[Guest]

Took some trys but I think that might just have been the issue

SELECT a.key, a.data, a.date_added FROM (SELECT ('customer_' || ca.key) AS `key`, ca.data, ca.date_added FROM `customer_activity` ca UNION SELECT ('affiliate_' || aa.key) AS `key`, aa.data, aa.date_added FROM `affiliate_activity` aa) a ORDER BY a.date_added DESC LIMIT 0,5

That looks like it works! Thanks so much!

[Jacques1]

What's the matter with those random subselects? Just do a union of two queries:

SELECT
  'customer_' || ca.key AS key,
  ca.data,
  ca.date_added
FROM
  customer_activity AS ca
UNION
SELECT
  'affiliate_' || aa.key,
  aa.data,
  aa.date_added
FROM affiliate_activity AS aa
ORDER BY
  date_added DESC
LIMIT
  0, 5
;

[Guest]

@Jacques1 would that be more efficient? Also did you format that by hand or use a tool?

 

I came across another one that throws something into the mix I dont know anything about the LEFT JOIN 

SELECT `or`.order_recurring_id, `or`.order_id, `or`.reference, `or`.`status`, `or`.`date_added`, CONCAT(`o`.firstname, ' ', `o`.lastname) AS customer FROM `order_recurring` `or` LEFT JOIN `order` `o` ON (`or`.order_id = `o`.order_id) ORDER BY or.order_recurring_id DESC LIMIT 0,20

Query Error: near "or": syntax error Unable to execute statement

 

Im assuming its the first `or` where the error is but it looks good to me (is there a way to tell where a sqlite error occured? like character count or something)

[Jacques1]

“OR” is a reserved word in SQL, representing the logical “OR” operation.

 

It's theoretically possible to use it anyway if you always(!) put it in quotes, but this is very bad style and a bad habit you need to get rid of. Don't use reserved words as identifiers, and don't clutter your queries with backticks. Whether those cryptic aliases even make sense is also questionable, because they don't exactly improve readability. If typing a few characters annoys you so much, use a proper IDE with SQL autocompletion.

[Guest]

That was it! I thought it was something more complicated

I didnt make these sql statements im just converting a script so didnt have any say in the or

Thank you guys!