[Solved] Given the table definition:CREATE TABLE users (id INT, name... CREATE TABLE users_p3 PARTITION OF users FOR VALUES WITH (MODULUS 4, REMAINDER 3);Which partition will the row with id = 7 be stored in? | PostgreSQL

PostgreSQL - Table Partitioning

Given the table definition:

CREATE TABLE users (id INT, name TEXT) PARTITION BY HASH (id);
CREATE TABLE users_p0 PARTITION OF users FOR VALUES WITH (MODULUS 4, REMAINDER 0);
CREATE TABLE users_p1 PARTITION OF users FOR VALUES WITH (MODULUS 4, REMAINDER 1);
CREATE TABLE users_p2 PARTITION OF users FOR VALUES WITH (MODULUS 4, REMAINDER 2);
CREATE TABLE users_p3 PARTITION OF users FOR VALUES WITH (MODULUS 4, REMAINDER 3);

Which partition will the row with id = 7 be stored in?

Ausers_p3

Busers_p1

Cusers_p2

Dusers_p0

Step-by-Step Solution

Solution:

Step 1: Calculate hash partition remainder
Partition is chosen by (hash(id) % modulus). Assuming hash(id) = id for simplicity, 7 % 4 = 3.
Step 2: Match remainder to partition
Remainder 3 corresponds to partition users_p3.
Final Answer:
users_p3 -> Option A
Quick Check:
7 % 4 = 3 -> users_p3 [OK]

Quick Trick: Compute id % modulus to find partition remainder [OK]

Common Mistakes:

Confusing remainder with modulus
Using id directly without modulo
Mixing partition numbers

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Given the table definition:

Step 1: Calculate hash partition remainder

Step 2: Match remainder to partition

Final Answer:

Quick Check:

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