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Distinct (schema API)

Lists the distinct values of a column, or the distinct combinations of several, sorted the way you ask.
Method GET
URL /api/schema/admin/mysql8/inventory/customers/distinct/:field[/:order]
Body none
Query params find
Answer data : an array of objects, one per distinct value or combination
Databases MongoDB, MySQL, MariaDB, PostgreSQL, SQL Server, Oracle, TiDB, Percona
Cached yes, with enableCaching on the table
From code g.sys.db.distinct
API id SCHEMA_GET_DISTINCT (groups, settings, hooks, WebSocket subscriptions)
The other family Distinct as a generated API

Generated (/api/gen) or schema (/api/schema) ?

Both families offer the same operations on the same URL pattern. The schema APIs read the schema of the table : values are converted to their types, validated, encrypted, defaulted and numbered before they reach the database. The generated APIs are schemaless : they pass your data as it is, so a number sent as "22" stays a string. Use the schema APIs for the tables your application writes to, and the generated APIs for quick reads and for tables without a schema.

The URL

/api/schema/admin/mysql8/inventory/customers/distinct/:field[/:order] : replace admin with the user path of your account, mysql8 with your instance, inventory with the database and customers with the table. The examples use this table :

customer_id first_name last_name last_update pincode isActive
1 Bob lin 2022-11-14 04: 34: 58 382345 1
2 Alice Page 2022-10-15 02: 10: 40 382346 1
3 Mallory Brown 2022-09-13 03: 44: 05 382347 1
4 Eve Mathly 2022-11-12 01: 59: 33 382348 1
5 Eve Page 2022-11-12 01: 59: 33 382349 1

One column

GET /api/schema/admin/mysql8/inventory/customers/distinct/pincode

{ "success": true, "statusCode": 200, "data": [ { "pincode": 382345 }, { "pincode": 382346 }, { "pincode": 382347 } ] }
  • Ascending by default. Descending : /api/schema/admin/mysql8/inventory/customers/distinct/pincode/desc (also -1, dsc, 0, false ; ascending is asc, 1, true).

Several columns

GET /api/schema/admin/mysql8/inventory/customers/distinct/first_name,pincode
GET /api/schema/admin/mysql8/inventory/customers/distinct/first_name,pincode/asc,desc

{ "success": true, "statusCode": 200, "data": [ { "first_name": "Alice", "pincode": 382346 }, { "first_name": "Bob", "pincode": 382345 }, { "first_name": "Eve", "pincode": 382349 }, { "first_name": "Eve", "pincode": 382348 } ] }
  • One order per column, in the same position. A missing order is ascending.

With a filter

GET /api/schema/admin/mysql8/inventory/customers/distinct/pincode?find={isActive:1}

Good to know

  • A column which is empty everywhere gives [].
  • Field permissions apply : a column the group can not read can not be listed.

From your code

g.sys.db.distinct makes the same call from custom APIs, hooks, events, schedulers and test cases, with the same headers and params. Pass true as the second argument to get the whole response envelope instead of data.

Headers

Every call takes the request headers : the tokens, x-am-response-case, x-am-content-type-response (JSON, XML, YAML…), x-am-response-object-type: make_flat, x-am-cache-control, x-am-get-encrypted-data, x-am-internationalization, x-am-tenant-username, x-am-meta.

Errors

Code When
401 The token in x-am-authorization is missing or invalid.
403 No group of the API user grants this API of this table, or a field of the request.
404 The instance, database or table of the URL does not exist, or the table has no schema (use /api/gen).
400 The query or the body is wrong : the error messages say which key and why.