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I'm working on a web project with PostgreSQL as a databases. I'm trying to build a structure of the web's databases that include a vector space model table.
I created a table with attribute terms and docId[] where docId is the document ID of the term. Type of the docId is integer[]. So I can input a term with the document list that include the term in one single array. But the docId's array of term may contain a lot of entries.
So my question is: what is the max size of a 1-dimension array in Postgres?
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PostgreSQL ARRAY_LENGTH() function This function is used to return the length of the requested array dimension. Syntax: array_length(anyarray, int) Return Type : PostgreSQL Version: 9.3. Example: PostgreSQL ARRAY_LENGTH() function.
The Array Type With the Array PostgreSQL allows columns of a table to be defined as variable-length multidimensional arrays. Arrays of any built-in or user-defined base type, enum type, composite type, range type, or domain can be created.
After some research, it turns out that PostgreSQL arrays are one-based: The array subscript numbers are written within square brackets. By default PostgreSQL uses a one-based numbering convention for arrays, that is, an array of n elements starts with array[1] and ends with array[n].
There is no size limit on Postgres arrays. There must be limits on row or column size, but that would run in the millions of entries.
A more SQL way to relate term to document is a 1 to many relation. This is implemented like:
table term: columns term_id, term, document_id
table document: columns document_id, summary, ...
The document_id column in the term table is called a foreign key.
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