[Solved] You want to create a GIN index on a table orders with a column items that stores... Which statement correctly creates the index and optimizes queries checking if an integer is present in the array? | PostgreSQL

PostgreSQL - Indexing Strategies

You want to create a GIN index on a table orders with a column items that stores an array of integers. Which statement correctly creates the index and optimizes queries checking if an integer is present in the array?

ACREATE INDEX idx_items_gin ON orders USING GIN (items gin_int_ops);

BCREATE INDEX idx_items_gin ON orders USING GIN (items gin__int_ops);

CCREATE INDEX idx_items_gin ON orders USING GIN (items gin__intarray_ops);

DCREATE INDEX idx_items_gin ON orders USING GIN (items);

Step-by-Step Solution

Solution:

Step 1: Identify correct GIN index syntax for integer arrays
For integer arrays, the default GIN index supports containment and membership queries without specifying operator classes.
Step 2: Validate options
Options B, C, and D use invalid operator class names like gin__int_ops or gin__intarray_ops, which do not exist in PostgreSQL.
Final Answer:
CREATE INDEX idx_items_gin ON orders USING GIN (items); -> Option D
Quick Check:
Default GIN index on array column = CREATE INDEX idx_items_gin ON orders USING GIN (items); [OK]

Quick Trick: Use default GIN index on array column without extra ops [OK]

Common Mistakes:

Using non-existent operator classes
Adding unnecessary syntax after column name
Confusing GIN with other index types

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Which statement correctly creates the index and optimizes queries checking if an integer is present in the array?

Step 1: Identify correct GIN index syntax for integer arrays

Step 2: Validate options

Final Answer:

Quick Check:

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