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SQLize.online is a free online SQL environment for quickly running, experimenting with and sharing code.
You can run your SQL code on top of the most popular RDBMS including MySQL, MariaDB, SQLite, PostgreSQL, Oracle and Microsoft SQL Server.
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create table tst1 ( id bigint primary key, key text not null, value text not null ); insert into tst1 (id, key, value) select i, 'k'||i, 'v'||(i*7) from generate_series(1, 100000) g (i); create index idx_tst1_key on tst1 (key asc); vacuum analyze tst1; select pg_size_pretty(pg_indexes_size('tst1')); -- as expected: index scan explain (analyze, buffers) select id from tst1 where key = 'v111'; -- seq scan because this index can not work with `like` explain (analyze, buffers) select id from tst1 where key like 'v111%'; explain select id from tst1 where key > 'v111'; drop index idx_tst1_key; create index idx_tst1_key_c on tst1 (key collate "C" asc); select pg_size_pretty(pg_indexes_size('tst1')); -- now the index works explain (analyze, buffers) select id from tst1 where key like 'v111%'; -- but explain (analyze, buffers) select id from tst1 where key = 'v111'; -- haha, it does not work with equals explain select id from tst1 where key > 'v111'; drop index idx_tst1_key_c; create index idx_tst1_key_pattern on tst1 (key text_pattern_ops asc); select pg_size_pretty(pg_indexes_size('tst1')); -- now this works explain (analyze, buffers) select id from tst1 where key = 'v111'; -- and this works explain (analyze, buffers) select id from tst1 where key like 'v111%'; explain select id from tst1 where key > 'v111';
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