ClickHouse/dbms/tests/queries/0_stateless/00205_scalar_subqueries.sql

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SET send_logs_level = 'none';
SELECT (SELECT (SELECT (SELECT (SELECT (SELECT count() FROM (SELECT * FROM system.numbers LIMIT 10)))))) = (SELECT 10), ((SELECT 1, 'Hello', [1, 2]).3)[1];
SELECT toUInt64((SELECT 9)) IN (SELECT number FROM system.numbers LIMIT 10);
SELECT (SELECT toDate('2015-01-02')) = toDate('2015-01-02'), 'Hello' = (SELECT 'Hello');
SELECT (SELECT toDate('2015-01-02'), 'Hello');
SELECT (SELECT toDate('2015-01-02'), 'Hello') AS x, x, identity((SELECT 1)), identity((SELECT 1) AS y);
SELECT (SELECT uniqState('')); -- { serverError 125 }