I am trying to build sql queries with slick where I need to intersect the results. I can build it with union (from Slick docs):
val q1 = coffees.filter(_.price < 8.0)
val q2 = coffees.filter(_.price > 9.0)
val unionQuery = q1 union q2
// compiles to SQL (simplified):
// select x8."COF_NAME", x8."SUP_ID", x8."PRICE", x8."SALES", x8."TOTAL"
// from "COFFEES" x8
// where x8."PRICE" < 8.0
// union select x9."COF_NAME", x9."SUP_ID", x9."PRICE", x9."SALES", x9."TOTAL"
// from "COFFEES" x9
// where x9."PRICE" > 9.0
I need to do something similar to this:
val q1 = coffees.filter(_.price < 8.0)
val q2 = coffees.filter(_.price > 9.0)
val intersectQuery = q1 intersect q2
// compiles to SQL (simplified):
// select x8."COF_NAME", x8."SUP_ID", x8."PRICE", x8."SALES", x8."TOTAL"
// from "COFFEES" x8
// where x8."PRICE" < 8.0
// intersect select x9."COF_NAME", x9."SUP_ID", x9."PRICE", x9."SALES", x9."TOTAL"
// from "COFFEES" x9
// where x9."PRICE" > 9.0
I've read here that there was a PR meant to do that but it's from 10 years ago and I can't see that code in the current source code. I am using Scala 2.13.
I've tried:
- Looking for the method in the Query object.
- Going through the official docs
- Look for creative methods or what other people do in this situations