[Solved] Given the following SQL commands:CREATE TEXT SEARCH CONFIGURATION my_english ( COPY = english... SELECT to_tsvector('my_english', 'PostgreSQL is great!');What is the output of the SELECT statement? | PostgreSQL

PostgreSQL - Full-Text Search

Given the following SQL commands:

CREATE TEXT SEARCH CONFIGURATION my_english ( COPY = english );
ALTER TEXT SEARCH CONFIGURATION my_english
  ALTER MAPPING FOR asciiword, asciihword, hword_asciipart
  WITH simple;
SELECT to_tsvector('my_english', 'PostgreSQL is great!');

What is the output of the SELECT statement?

A'postgresql':1 'great':3 'is':2 'simple':5

B'postgresql':1 'great':3 'is':2

C'postgresql':1 'great':3

DSyntax error due to ALTER MAPPING

Step-by-Step Solution

Solution:

Step 1: Understand ALTER MAPPING effect
The ALTER MAPPING changes how asciiword and related tokens are processed, using the simple dictionary which does not remove stop words.
Step 2: Analyze to_tsvector output
The text 'PostgreSQL is great!' produces tokens: 'PostgreSQL' (pos 1, asciiword) -> 'postgresql':1; 'is' (pos 2, asciiword) -> 'is':2; 'great' (pos 3, asciiword) -> 'great':3. Simple indexes all without dropping stopwords. Matches 'postgresql':1 'great':3 'is':2.
Final Answer:
'postgresql':1 'great':3 'is':2 -> Option B
Quick Check:
Alter mapping changes dictionary used [OK]

Quick Trick: ALTER MAPPING changes dictionary for word processing [OK]

Common Mistakes:

Assuming stop words are always removed
Confusing dictionary effects on stemming and stop words
Expecting syntax error from ALTER MAPPING

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Given the following SQL commands:

Step 1: Understand ALTER MAPPING effect

Step 2: Analyze to_tsvector output

Final Answer:

Quick Check:

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