0
votes
1answer
16 views

PostgreSQL: How does the implicit index work when using “COPY” for loading bulk rows into a newly created table?

What I know for fast loading bulk rows into a new table is: Create the table(without creating the index) Use "COPY" to load data from a file into the table Create the index What if I added a ...
1
vote
1answer
98 views

Alternatives to NULL for missing data [duplicate]

I am using PostgreSQL and trying to write value constraints. Is it possible to record missing data as distinct from NULL values in a numeric field without using an arbitrary numeric value? For many ...
1
vote
1answer
103 views

How do I validate all my constraints in postgresql?

It seems like I have been bitten by the first bug described in the release notes of postgresql 9.3.4: http://www.postgresql.org/docs/devel/static/release-9-3-4.html I now have e.g. duplicate primary ...
2
votes
1answer
214 views

Two-column foreign key constraint only when third column is NOT NULL

Given the following tables: CREATE TABLE verified_name ( id SERIAL PRIMARY KEY, name TEXT NOT NULL, email TEXT NOT NULL, UNIQUE (name, email) ); CREATE ...
0
votes
1answer
31 views

Conditional when creating a domain

How can I define or change a domain based on another attribute value? F.e. domain for salary is a numeric value > 500. But if a date the person was hired > January 1st, 2013, then the salary must be ...
1
vote
1answer
95 views

Create constraint for stopping mass update to a table

I want to create a constraint so that if more than 5 rows in a table are getting updated with an UPDATE statement it should warn the user / block the query.
1
vote
0answers
161 views

postgresql multi column unique or check constraint

First a word of pleading. To say I am a newbie to postgresql would be an insult to the newbies! I have been working on this for only a day or so. I have found several questions on this site, and ...
2
votes
1answer
127 views

PostgreSQL 9.2 tstzrange null/infinity CONSTRAINT CHECK

I'd like to limit a PostgreSQL 9.2 tstzrange to valid dates at both ends. No NULLs nor 'infinity'. Various revisions of this SQL isn't constraining '-/+infinity' input: CREATE TABLE bill ( id ...
0
votes
0answers
485 views

PostgreSQL Cascade Delete not working

What am I missing here? I have two tables: CREATE TABLE source ( "sourceid" serial, "state" character varying(255) REFERENCES states (state), "leadtime" character varying(255), CONSTRAINT ...
3
votes
1answer
277 views

Complex constraint across all data in a table

We have a table to record processing that occurs on a system and we need to ensure that only a single row has an 'in process' status. I want to ensure that the result of this is always either zero or ...
1
vote
2answers
98 views

Constraint on Composite Type

How can I create a constraint on a sub-field of composite type? Pseudocode create type axis( major_axis float, minor_axis float, angle float constraint angle_constraint check(angle ...
2
votes
1answer
409 views

Why does Postgres generate an already used PK value?

I'm using Django, and every once in a while I get this error: IntegrityError: duplicate key value violates unique constraint "myapp_mymodel_pkey" DETAIL: Key (id)=(1) already exists. My database ...
2
votes
2answers
67 views

Postgresql constrains on FK

I am trying to design a (part of a) database which has to accomplish the following: There is a students table, containing a bunch of students. There are educations in the database. Each student can ...
5
votes
2answers
784 views

Transactions, references and how to enforce double entry bookkeeping? (PG)

Double entry bookkeeping is a set of rules for recording financial information in a financial accounting system in which every transaction or event changes at least two different nominal ...
0
votes
1answer
527 views

Getting error while importing large data through csv

I am new Postgres. I am getting constraint violation errors while importing a large CSV file. I want to disable all of the database constraints temporarily - I do not know how to do this.
5
votes
2answers
414 views

Custom unique column constraint, only enforced if one column has a specific value

Is it possible to have a custom unique column constraint as follows? Suppose I have two cols, subset and type, both strings (though the data types probably doesn't matter). If type is "true", then ...
7
votes
1answer
2k views

PostgreSQL EXCLUDE USING error: Data type integer has no default operator class

In PostgreSQL 9.2.3 I am trying to create this simplified table: CREATE TABLE test ( user_id INTEGER, startend TSTZRANGE, EXCLUDE USING gist (user_id WITH =, startend WITH &&) ); ...
10
votes
1answer
11k views

Optimal way to ignore duplicate inserts?

Background This problem relates to ignoring duplicate inserts using PostgreSQL 9.2 or greater. The reason I ask is because of this code: -- Ignores duplicates. INSERT INTO db_table ...
3
votes
1answer
2k views

Will FK ON UPDATE CASCADE work?

Intuitively, adding the option ON UPDATE CASCADE to a foreign key constraint will have the effect of updating all referencing columns with the updated value of the key. Would that really work? ...
2
votes
1answer
177 views

Constrain input to a few different strings

Hi I can't seem to get a constraint working the way I expect in postgreSQL. From within pgadmin I execute the following SQL query. -- Check: "TypeCheck" -- ALTER TABLE "ComLog" DROP CONSTRAINT ...
4
votes
1answer
3k views

disable constraints before using pg_restore.exe

When I try to execute pg_restore.exe of a dump file from a database, it throws dozens of errors, all the same: ERROR: insert or update on table "someTable" violates foreign key constraint ...
16
votes
3answers
9k views

PostgreSQL multi-column unique constraint and NULL values

I have a table like the following: create table my_table ( id int8 not null, id_A int8 not null, id_B int8 not null, id_C int8 null, constraint pk_my_table primary key (id), constraint ...
7
votes
2answers
3k views

Non-unique multicolumn foreign key

I have a "comments" table that models a conversation on a topic, like this: id serial topic_id integer parent_comment_id integer body text So, every comment has a reference to its topic AND ...