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sql_examples.sql

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Struchkov Mark 2022-11-04 19:03:02 +03:00
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EXPLAIN ANALYSE
SELECT *
FROM post
ORDER BY create_on
FETCH FIRST 50 ROWS ONLY;
EXPLAIN ANALYSE
SELECT *
FROM post
ORDER BY create_on
OFFSET 50 ROWS FETCH NEXT 50 ROWS ONLY;
EXPLAIN ANALYSE
SELECT *
FROM post
ORDER BY create_on
OFFSET 9950 ROWS FETCH NEXT 50 ROWS ONLY;
CREATE INDEX idx_post_created_on ON post (create_on DESC);
CREATE INDEX idx_post_created_on ON post (create_on DESC, id DESC);
EXPLAIN ANALYSE
SELECT *
FROM post
ORDER BY create_on DESC, id DESC
FETCH FIRST 50 ROWS ONLY;
EXPLAIN ANALYSE
SELECT *
FROM post
WHERE (create_on, id) < ('2022-10-30 00:11:43.224314', '8766d496-44c7-4e48-af29-b19178692cd9')
ORDER BY create_on DESC
FETCH FIRST 50 ROWS ONLY