Questions tagged [composite-types]
The composite-types tag has no usage guidance.
57
questions
0
votes
1
answer
37
views
How do I create a primary composite key from three tables?
Suppose I have tableA with A.id, tableB with B.id and table C with C.id. Now I want to create a table D that has a primary composite key(A.id, B.id, C.id). How can I do this?
create tableD(
A.id ....
1
vote
1
answer
41
views
Postgres before insert trigger access field of a type
In the DB, I have a type and a table that one of it's rows is that type, such as this:
CREATE TYPE state (last_active timestamp, ...)
CREATE TABLE devices ( state state, ... )
For any interaction ...
- 113
1
vote
1
answer
63
views
Variadic functions and composite types
I have a function like so:
update_stuff_variadic(
VARIADIC _stuff_array stuff[]
)
I understand that this syntax requires _stuff_array to match the column structure of the stuff[] table.
Instead ...
- 27
0
votes
1
answer
90
views
Define recursive composite types
Is it possible to define recursive composite types in Postgres 13?
create type "t" as (
"a" int,
"b" t
);
I am aware that I can use a table with a parent-child ...
- 301
0
votes
2
answers
29
views
Finding "one of" entries to a composite key/index
Problem:
Assuming I have a table like this:
CREATE TABLE `test` (
`id` bigint unsigned NOT NULL AUTO_INCREMENT,
`a_id` bigint unsigned NOT NULL,
`b_id` bigint unsigned NOT NULL,
`c_id` bigint ...
- 111
3
votes
2
answers
751
views
How to specify not null contraints for the fields of composite types in postgres
Let's say I would like to have a composite type for address, like:
create type address as (
city text,
address_line text,
zip_code int
);
And to make data integrity better, I don't want to ...
- 133
-1
votes
1
answer
508
views
why is mysql not using the composite index on my query?
Here is my query.
select user_id, sum(user_points.points) overallpts, username
from user
inner join user_points on user.user_id = user_points.user_id
where user_points.date >= '2020-01-01 00:00:00'
...
- 59
0
votes
1
answer
640
views
(PostgreSQL 11) Reading in an array of JSON objects (or composite types) from a CSV file into Postgres
So I am trying to import rows into a table using a CSV file, but have been running into problems I haven't been able to solve. I would like one column of a row to be an array of JSON objects.
How I ...
- 5
-1
votes
1
answer
208
views
Designing a database for car dealerships [closed]
I am starting in designing a database for car dealerships (plural). I graduated recently and this is my first gig.
The idea is that I am designing a backend that couple of dealerships will use. So we ...
- 1
0
votes
1
answer
462
views
Use insert trigger to copy a modified NEW record to another table, with unknown columns
I use a Postgres extension (promscale) that dynamically creates tables with similar schemas: the tables all have a 'time' and a 'value' columns, then a number of labels columns.
Upon insert in any of ...
- 13
3
votes
1
answer
921
views
How to extract fields of anonymous row type in PostgreSQL
In PostgreSQL I can create an anonymous row or composite type
postgres=# SELECT ROW(1,'Hello',false) as r;
r
-------------
(1,Hello,f)
(1 row)
But how can I get the fields out again? None of ...
- 1,379
1
vote
0
answers
47
views
Postgresql index size: penalty for composite type?
My question refers to Postgresql 12.2.
I have two almost identical tables, structure- and contentwise, the main difference being that the primary key of the second table is a composite type, while the ...
- 113
0
votes
1
answer
96
views
Better way to ensure referential integrity of one column to a composite primary key?
Given a first table
CREATE TABLE table1 (
column1 INTEGER,
column2 TEXT,
PRIMARY KEY (column1, column2));
does SQL have an idiomatic way to constrain column3 in a second table
CREATE ...
- 103
1
vote
1
answer
291
views
Assign a value to a field of a composite type (a row in an array of rows)?
I am currently writing a function that works with an array of rows. I need to write a value to a particular column of a particular row in the array. The following code should encapsulate the problem I'...
- 21
1
vote
1
answer
458
views
Composite index performance with varchar columns
I have large fact tables with composite non-clustered indexes, something like this:
NONCLSUTERED INDEX (OrderDate,OrderType,ClientKey,ItemKey,CustomerKey)
The columns ending with "Key" are varchar(...
- 266
0
votes
0
answers
621
views
Postgres. INSERT INTO table in stored procedure with array of composite type objects as procedure arguments
I have two composite types:
CREATE TYPE truck.truck_event_type AS
(
event_global_key VARCHAR(100),
event_type VARCHAR(50),
datetime_utc TIMESTAMP(4),
...
- 101
0
votes
1
answer
767
views
AutoIncrement non-primary key or Make unique composite key?
I have a db with a table that has a rollover value such as OrderNumber and another column is year.
This is the primary key - a composite key - but there are other tables with which I need to use a ...
- 155
0
votes
1
answer
1k
views
Postgres: foreign key constraint for components of a composite type?
In Postgres, is it possible to set up a foreign key contraint involving components of a composite type, in a situation like the following one?
Suppose I have
CREATE TABLE main (
-- a and b are ...
- 113
3
votes
2
answers
3k
views
ENUM and ID as a Foreign Key
Using PostgreSQL 11.
I've tried digging through both Stack Overflow and here and was unable to find an answer on best practices.
I'm working on a database design and have arrived at a schema that ...
- 35
2
votes
2
answers
49
views
NULL rows and IS NULL
I've been writing some queries that look like this:
SELECT
...
FROM table_a a
LEFT JOIN table_b b
ON b.id = a.id
LEFT JOIN table_c c
ON c.id = a.id
In these queries only one of the joins can ...
- 133
2
votes
0
answers
1k
views
Typeorm: How to make composite key in one table as foreign key in other table
I'm using Typeorm JavaScript not Typescript for PostgreSQL in Nodejs application. I have a two tables:
Resource
Passenger
In Resource Table I have id and type both are primary key and act
as ...
- 121
4
votes
2
answers
7k
views
PostgreSQL: cast row to type
I read: Use composite type to create new table
I have a table called locations, e.g. representing objects with lat. and long. coordinates.
In another table, I declared a column of type locations (just ...
- 218
0
votes
1
answer
54
views
PostgreSQL CREATE TYPE using multiple relations?
I'm becoming familiar with PostgreSQL's ability to define a data type https://www.postgresql.org/docs/current/sql-createtype.html using CREATE TYPE syntax.
It appears to me that this type does not ...
- 407
10
votes
3
answers
3k
views
Postgres jsonb vs composite type performance differences
What considerations are involved in choosing between a jsonb column and a composite type column of the same structure?
For example, consider a column like that used in the Postgres documentation:
...
- 203
2
votes
3
answers
2k
views
Pass array of mixed type into stored FUNCTION
I am preparing procedure, that is basically finishing payment. It takes all info as arguments and do all inserts and stuff in one transaction.
the problem here is, that one argument is list of n ...
- 131
1
vote
1
answer
3k
views
PostgreSQL - Return type and EXECUTE QUERY
My function returns a setof composite type, however the RETURN EXECUTE seems to return some other unknown type:
create type core.search_result as (
user_id uuid,
country core.country,
ethnicity ...
- 113
0
votes
1
answer
3k
views
Postgres FOREACH array as composite type
I'm trying to loop over an array with two types as a composite type, but it seems that I can not use the composite type as the variable array to loop over it. What I'm trying to accomplish:
create ...
- 103
6
votes
2
answers
1k
views
Is there a way to partially initialize a TYPE?
I have created a custom type:
CREATE TYPE my_type as(name text, street text, location text);
Initializing such a type is easy:
SELECT ROW('a', 'b', 'c')::my_type;
I am wondering if there is an ...
- 179
1
vote
1
answer
32
views
What type of rows does `SELECT my_table FROM my_table` return?
I sometimes encounter this SELECT statement (in JSON-related answers on stackexchanges):
SELECT my_table
FROM my_table;
It seems to turn a one-column result, with multiple rows.
What would be the ...
- 329
7
votes
1
answer
3k
views
How to work around Sequelize not supporting composite foreign keys
I am developing an advanced query with Sequelize (hitting a PostgreSQL database). It's not difficult in pure SQL, but I can't get it work in Sequelize, in part because they don't support composite ...
- 171
4
votes
3
answers
2k
views
Is there anyway to UPDATE a series of columns on a row with a composite type record/row?
Take a table foo,
CREATE TABLE foo(a,b,c,d)
AS VALUES
(1,2,3,4);
I can insert into foo with a row type..
INSERT INTO foo
SELECT (foo).*
FROM foo;
INSERT INTO foo
SELECT (v).*
FROM ( ...
- 55.7k
6
votes
1
answer
1k
views
Using a type in place of a column definition list?
Running the below, I get "a column definition list is required for functions returning "record"".
SELECT *
FROM json_to_record('{"a":1,"b":2,"c":3,"d":4}');
ERROR: a column definition list is ...
- 55.7k
1
vote
1
answer
9k
views
PostgreSQL function param json_populate_recordset ARRAY problem
Previous question: PostgreSQL function parameters JSON to TYPE
I am trying to create a sample of code using json_populate_recordset, but it seems I am doing something wrong. I have created a test_GPS ...
- 69
5
votes
2
answers
969
views
How to set/get a field of a nested composite type variable?
For example:
create type t1 as (a int2, b text, c boolean);
create type t2 as (a t1, b boolean);
create type t3 as (a t2, b int4);
Now, how can I do the following for a variable x of type t3:
x.a.a....
- 301
1
vote
1
answer
780
views
PostgreSQL function's input/output as JavaScript nested objects [closed]
I am looking for a simple/clean way that can be used consistently to automatically input JavaScript nested objects to user-defined PostgreSQL functions and also automatically output to JavaScript ...
- 301
2
votes
1
answer
3k
views
PostgreSQL parses string literal as record before calling cast
In my PostgreSQL 9.6 database, I have a composite type, let's call that type widget. I have a PL/pgSQL* function called text_to_widget that parses textual representations of widgets to widget values, ...
- 121
1
vote
0
answers
487
views
Postgres composite type not using index
I have a composite type where one subcolumn is an integer and the other is a numrange.
I'm using: PostgreSQL 9.6.2 on x86_64-pc-linux-gnu, compiled by gcc (Ubuntu 6.3.0-5ubuntu1) 6.3.0 20170124, 64-...
- 185
2
votes
1
answer
1k
views
Column does not exists when accessing inner type field in ORDER BY
In PostgreSQL 9.4 I have two types:
CREATE TYPE a_schema.type_child {
an_order smallint
}
CREATE TYPE a_schema.type_parent {
pluto uuid,
child type_child
}
Then in a view I have this script:...
- 277
7
votes
2
answers
19k
views
Use array of composite type as function parameter and access it
I have created a type Books in Postgres which has 2 numeric fields and 2 varchar fields. I want to send an array of Books to a function to INSERT those values in a matching table.
This is my type:
...
2
votes
0
answers
73
views
Any drawbacks to referencing multiple tables from a single column?
I'm working on a system with the following entities:
Projects
Sections
Activities
There is one important constraint that needs to be enforced:
Activities are always part of one project. Activities ...
- 173
1
vote
0
answers
2k
views
Is there a way of implementing a composite primary key with varying fields in MongoDB?
Here is the information about my development environment:
-Mongodb 3.0.0
-Microsoft Visual Studio Professional 2013
-.NET Framework 4.5
We are trying to design some MongoDB collections at work ...
- 121
9
votes
2
answers
5k
views
Use composite type to create new table
In ORDBMS databases I have seen that complex types can be used:
create type name as( ...)
And I can references those types when creating a new table, like:
create table example (row_name ref(name))
...
- 247
6
votes
1
answer
4k
views
Return type of JOINing stored procedure - PostgreSQL
Is it possible to express return type of stored procedure that returns joined tables using table type of one of joined tables?
My stored procedure looks like this:
CREATE or REPLACE FUNCTION ...
- 443
3
votes
1
answer
310
views
INSERT inside PL/pgSQL function gives different result
In PostgreSQL 9.4.1 I have created a custom type my_test_type and have found that doing a basic INSERT with NULL::my_test_type gives an expected result, but with NULL::my_test_type as a function ...
- 815
1
vote
1
answer
267
views
Table-based custom type does not verify check constraints
Is there any way for a table-based custom type to obey the table check constraints, other than creating my own type based on the table?
Assume the following table that serves as a source for the ...
- 13
0
votes
1
answer
73
views
persistence entity with composite key
I have class named 'User'. It has the following properties
firstname
lastname
mobile
email
pin
I want to design a table or hibernate entity that will have unique email for each row; the same for ...
5
votes
2
answers
3k
views
Good layout of 3d point data for spatial queries in Postgres?
Like shown in another question, I deal with a lot (>10,000,000) entries of points in a 3D space. These points are defined like this:
CREATE TYPE float3d AS (
x real,
y real,
z real);
If I am ...
- 847
3
votes
1
answer
201
views
Is 'internallength' always useful in custom type definition in Postgres?
In our database we use a custom type to store 3D locations:
CREATE TYPE float3d AS (
x real,
y real,
z real);
In many examples I see INTERNALLENGTH used as a parameter with the definition of ...
- 847
10
votes
1
answer
11k
views
How to access NEW or OLD field given only the field's name?
I'm writing a validation trigger. The trigger must validate that the sum of an array equals another field. Since I have many instances of this validation, I want to write a single procedure and create ...
- 1,353
8
votes
1
answer
9k
views
Automatic conversion of anonymous records returned from an UDF to well known table-type
Proprietary code (that we cannot change) has a bunch of user defined functions of the type:
create or replace function f() returns record as $$ ... $$
which we call in the following way (for example)...
- 820