query

const (
	// EqualsOperator takes two operands and tests if they are equal
	EqualsOperator eqOperator = "eq"
	// NotEqualsOperator takes two operands and tests if they are not equal
	NotEqualsOperator neOperator = "ne"
	// GreaterThanOperator takes two operands and tests if the left is greater than the right
	GreaterThanOperator gtOperator = "gt"
	// GreaterThanOrEqualOperator takes two operands and tests if the left is greater than or equal the right
	GreaterThanOrEqualOperator geOperator = "ge"
	// Contains takes two operands and tests if the left contains the right
	ContainsOperator containsOperator = "contains"
	// LessThanOperator takes two operands and tests if the left is lesser than the right
	LessThanOperator ltOperator = "lt"
	// LessThanOrEqualOperator takes two operands and tests if the left is lesser than or equal the right
	LessThanOrEqualOperator leOperator = "le"
	// InOperator takes two operands and tests if the left is contained in the right
	InOperator         inOperator         = "in"
	InSubqueryOperator inSubqueryOperator = "inSubquery"
	// NotInOperator takes two operands and tests if the left is not contained in the right
	NotInOperator notInOperator = "notin"
	// NotExistsSubquery receives a sub-query as single left-operand and checks the sub-query for rows existence. If there're no rows then it will return TRUE, otherwise FALSE.
	// Applicable for usage only with ExistQuery Criterion type
	NotExistsSubquery notExistsSubquery = "notexists"
	// ExistsSubquery receives a sub-query as single left-operand and checks the sub-query for rows existence. If there are any, then it will return TRUE otherwise FALSE.
	// Applicable for usage only with ExistQuery Criterion type
	ExistsSubquery existsSubquery = "exists"
	// EqualsOrNilOperator takes two operands and tests if the left is equal to the right, or if the left is nil
	EqualsOrNilOperator enOperator = "en"

	NoOperator noOperator = "nop"
)

const (
	// OrderBy should be used as a left operand in Criterion
	OrderBy string = "orderBy"
	// Limit should be used as a left operand in Criterion to signify the
	Limit string = "limit"
)

const (
	// Separator is the separator between queries of different type
	Separator string = "and"
)