当前位置：网站首页>请问有没有人知道clickhouse 中 limit语句执行的逻辑，图片中，上面的SQL可以执行成功
请问有没有人知道clickhouse 中 limit语句执行的逻辑，图片中，上面的SQL可以执行成功
2022-07-01 09:43:00 【阿里云问答】
请问有没有人知道clickhouse 中 limit语句执行的逻辑，图片中，上面的SQL可以执行成功，但是读取数据的速率较慢200Mb/s，下方的sql则执行失败，报Memory limit (for query) exceeded，内存不够了，但是数据读取速率快，在4Gb/s。
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![Clickhouse: Test on query speed of A-share minute data [Part 2]](/img/c8/42ba748d38546d3b0d2be9b33c5d0b.jpg)
Clickhouse: Test on query speed of A-share minute data [Part 2]
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