ClickHouse/tests/queries/0_stateless/01455_time_zones.sql

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-- There are currently 594 timezones which are used from the binary embedded inside the ClickHouse binary
-- Refer: contrib/cctz-cmake/CMakeLists.txt for the complete list. The count may change but we expect there will be at least 500 timezones.
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-- SELECT count(*)
-- FROM system.time_zones
--
-- ┌─count()─┐
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-- │ 594 │
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-- └─────────┘
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SELECT if ((SELECT count(*) FROM system.time_zones) > 500, 'ok', 'fail');