Understanding Hyperledger Composer Query Language

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enum UserRole {
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  o ADMIN
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  o MODERATOR
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  o USER
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}
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participant User identified by id {
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  o String id
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  o String name
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  o UserRole role
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  o String[] hobbies
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  --> Organization organization
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}
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participant Organization identified by id {
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  o String id
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  o String name
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}
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asset Product identified by id {
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  o String id
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  o String name
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  o String description
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  o Double quantity
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  o DateTime createdAt
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  --> Organization owner
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}

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query Q1 {
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  description: "Select all users based on role"
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  statement:
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      SELECT org.acme.User
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          WHERE (role == "ADMIN")
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}

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query Q1 {
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    description: "Select all users based on role"
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    statement:
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        SELECT org.acme.User
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            WHERE (role == _$role)
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}

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query Q2 {
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  description: "Select all users of an organization"
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  statement:
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      SELECT org.acme.User
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          WHERE (organization == "resource:org.acme.Organization#1")
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}

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query Q3 {
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  description: "Select all products above the minimum quantity"
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  statement:
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      SELECT org.acme.Product
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          WHERE (quantity > _$minimumThreshold)
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}

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query Q4 {
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  description: "Select all products above the minimum quantity of an organization"
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  statement:
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      SELECT org.acme.Product
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          WHERE ((quantity > _$minimumThreshold) AND (owner == _$organization))
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}

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query Q5 {
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  description: "Select all products above the minimum quantity of an organization and order by quantity"
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  statement:
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      SELECT org.acme.Product
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          WHERE ((quantity > _$minimumThreshold) AND (owner == _$organization))
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              ORDER BY quantity
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}

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query Q6 {
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  description: "Select all users based on givien hobbies"
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  statement:
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      SELECT org.acme.User
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          WHERE (hobbies CONTAINS ['driving', 'swimming']
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}