Commits on Apr 29, 2020

1. feat(sql): add support for sub-queries …

   You can use sub-queries in selects or in where conditions. To select subquery, use `qb.as(alias)` method:
   
   ```typescript
   const knex = orm.em.getKnex();
   const qb1 = orm.em.createQueryBuilder(Book2, 'b').count('b.uuid', true).where({ author: knex.ref('a.id') }).as('Author2.booksTotal');
   const qb2 = orm.em.createQueryBuilder(Author2, 'a');
   qb2.select(['*', qb1]).orderBy({ booksTotal: 'desc' });
   
   console.log(qb2.getQuery());
   // select `a`.*, (select count(distinct `b`.`uuid_pk`) as `count` from `book2` as `b` where `b`.`author_id` = `a`.`id`) as `books_total` from `author2` as `a` order by `books_total` desc
   ```
   
   When you want to filter by sub-query, you will need to register it first via `qb.withSubquery()`:
   
   > The dynamic property (`booksTotal`) needs to be defined at the entity level (as `persist: false`).
   > You always need to use prefix in the `qb.withSchema()` (so `a.booksTotal`).
   
   ```typescript
   const knex = orm.em.getKnex();
   const qb1 = orm.em.createQueryBuilder(Book2, 'b').count('b.uuid', true).where({ author: knex.ref('a.id') }).getKnexQuery();
   const qb2 = orm.em.createQueryBuilder(Author2, 'a');
   qb2.select('*').withSubQuery(qb1, 'a.booksTotal').where({ 'a.booksTotal': { $in: [1, 2, 3] } });
   
   console.log(qb2.getQuery());
   // select `a`.* from `author2` as `a` where (select count(distinct `b`.`uuid_pk`) as `count` from `book2` as `b` where `b`.`author_id` = `a`.`id`) in (?, ?, ?)
   ```

   

   B4nan committed Apr 29, 2020
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