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TRUNCATE TABLE performance_schema.events_statements_summary_by_digest; NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL NULL 1 2 3 NULL NULL NULL NULL NULL 1 2 3 NULL NULL 1 IS NULL 0 2 IS NOT NULL 1 1 IS NULL 2 IS NULL 3 IS NOT NULL 4 IS NOT NULL 0 0 1 1 SELECT SCHEMA_NAME, DIGEST_TEXT, COUNT_STAR FROM performance_schema.events_statements_summary_by_digest; SCHEMA_NAME DIGEST_TEXT COUNT_STAR test TRUNCATE TABLE `performance_schema` . `events_statements_summary_by_digest` 1 test SELECT ? 1 test SELECT ? FROM DUAL 1 test SELECT ?, ... 2 test SELECT ? IS NULL 1 test SELECT ? IS NOT NULL 1 test SELECT ? IS NULL , ? IS NULL , ? IS NOT NULL , ? IS NOT NULL 1 test CREATE TABLE `foo` ( `a` INTEGER DEFAULT ? , `b` INTEGER NOT NULL DEFAULT ? , `c` INTEGER NOT NULL ) 1 test DROP TABLE `foo` 1