Slick function for SQL exists - sql

Question

I want to construct an SQL along this but try not to use sqlu.
select el.oid, el.name, el.res_cat from el
left join bk on (el.cat = bk.cat and bk.oid=100)
where not exists (select 1 from dates bd where
el.oid=bd.lots_oid and bd.bk_oid = bk.oid) and el.e_oid=bk.e_oid
Are there Slick functions for SQL exists or not exists? Thanks
Update 1
I realized my mistakes when I revisited my Slick code again. I want to apologize for the false alarm I set. This is not an answer and hopefully someone can help me to rectify my mistakes. For the time being, I am using Slick's plain SQL to continue my work.
The Slick query I constructed didn't work. It was close to the SQL I wanted. What I did was,
val elQuery = elTable.joinLeft(bkTable)
.on((el, bk) => el.cat === bk.cat && bk.oid === 100)
val query = for {
a <- elQuery if bdTable.filterNot(bd => a._2.map(_.oid === bd.bkOid).isDefined && a._1.oid === bd.elOid).exists
} yield a
finalQuery.result.statements.foreach(x => Logger.debug(s"xx => $x"))
I notice filterNot does not generate a SQL not exists. This is the other portion that lost me.

Answer 1

I don't have enough reputation to make comment yet. But I assume that you want to get all rows that doesn't exit in dates table. I would rewrite your query like below:
SELECT
el.oid, el.name, el.res_cat.cat
FROM
el
LEFT JOIN bk ON bk.cat = el.cat
AND bk.e_oid = el.e_oid
AND bk.oid = 100
LEFT JOIN dates bd ON bd.lots_oid = el.oid
AND bd.bk_oid = bk.oid
WHERE
bd.lots_oid IS NULL
Explanation:
Instead of taking NOT EXISTS, you can achieve the same thing by LEFT JOIN dates and specify on WHERE condition that the primary key (PK) for dates IS NULL. I don't know the PK for dates table, so I just add the column I know. You should adjust it to the PK of dates table.
LEFT JOINing and WHERE PK IS NULL ensures you that the row doesn't exist on the left joined table.