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Help with an interesting Postgres question: Why isn't an Index Only Scan used on a partition accessed via the parent table?.
select version();
| version |
|---|
| PostgreSQL 9.5.25 on x86_64-pc-linux-musl, compiled by gcc (Alpine 11.2.1_git20220219) 11.2.1 20220219, 64-bit |
SELECT 1
CREATE TABLE t (Section CHAR(1), Status VARCHAR(10), Count integer);
INSERT INTO t VALUES ('A', 'Active', 1);
INSERT INTO t VALUES ('A', 'Inactive', 2);
INSERT INTO t VALUES ('B', 'Active', 4);
INSERT INTO t VALUES ('B', 'Inactive', 5);
INSERT 0 1
select * from t
| section | status | count |
|---|---|---|
| A | Active | 1 |
| A | Inactive | 2 |
| B | Active | 4 |
| B | Inactive | 5 |
SELECT 4
SELECT row_name AS Section,
category_1::integer AS Active,
category_2::integer AS Inactive
FROM crosstab('select section::text, status, count::text from t',2)
AS ct (row_name text, category_1 text, category_2 text);
ERROR: function crosstab(unknown, integer) does not exist LINE 4: FROM crosstab('select section::text, status, count::text fro... ^ HINT: No function matches the given name and argument types. You might need to add explicit type casts.