Loading TOC...
XQuery op:join-inner

MarkLogic Server 11.0 Product Documentation
ModifyPlan.prototype.joinInner

ModifyPlan.prototype.joinInner(
   rightPlan as String,
   [keys as ondef | ondef[]],
   [condition as xs.boolean]
) as ModifyPlan

Summary

This method returns all rows from multiple tables where the join condition is met. In the output row set, each row concatenates one left row and one right row for each match between the keys in the left and right row sets.

The join performs natural joins between columns with the same identifiers. To prevent inadvertent natural joins, specify a different qualifier for the left or right columns or use different column names for the left and right columns.

Parameters
rightPlan The row set from the right view.
keys Equality condition(s) expressed using one or more calls to the function op.on. These conditions are used to compare the left and right rows.
condition A boolean expression used to compare the left and right rows. See Boolean Expression Functions for the list of functions used to build boolean expressions.

Usage Notes

Both keys and condition are used to specify the join condition. keys allows for a simplified syntax for equality join condition. While condition allows for inequality and complex join conditions. This method combines keys and condition using an AND operator such that: 
      view
        .joinInner(
          otherView, 
          op.on(view.col('column1'), otherView.col('column2')),
          op.ge(view.col('column3'), otherView.col('column4'))
        )
is the same as 
      view
        .joinInner(
          otherView,
          null,
          op.and(
            op.eq(view.col('column1'), otherView.col('column2')),
            op.ge(view.col('column3'), otherView.col('column4'))
          )
        )

joinInner is a method of the following classes:

Example

const op = require('/MarkLogic/optic');

const employees = op.fromView('main', 'employees');
const expenses = op.fromView('main', 'expenses');

const Plan =
  employees.joinInner(expenses, op.on(employees.col('EmployeeID'),
                      expenses.col('EmployeeID')))
           .where(op.gt(expenses.col('Amount'), 150))
           .select([employees.col('EmployeeID'), 'FirstName',
                    'LastName', expenses.col('Amount')]);

  Plan.result()

Example

'use strict';
 
const op = require('/MarkLogic/optic');

const fruits = op.fromLiterals([
    {"fruit" : "mango", "count" : 10},
    {"fruit" : "apple", "count" : 7},
    {"fruit" : "orange", "count" : 9}
  ]);
const orders = op.fromLiterals([
    {"flavor" : "apple", "cups" : 5},
    {"flavor" : "orange", "cups" : 14}
  ]);

fruits.joinInner(
  orders,
  op.on(op.col('fruit'), op.col('flavor')),
  op.ge(op.col('count'), op.col('cups'))
)
.result()

// returns joined rows related to 'apple'.

Stack Overflow iconStack Overflow: Get the most useful answers to questions from the MarkLogic community, or ask your own question.