英文:
SQL CH calculate size in bytes for select
问题
如何获取SQX查询结果的字节大小？
例如，我想知道列值中有多少字节。我如何通过SQL查询获取此信息？我使用Clickhouse DB。
SELECT value, name
FROM stage.log
WHERE date >= '2023-02-04' and date < '2023-02-07')
AND (name = 'apple')
英文:
How I can get the size in bytes for the results of the SQX query?
For example, I want to know how many bytes are in the column value. How i can obtain this info by SQL query? I use Clickhouse DB
SELECT value, name
FROM stage.log
WHERE date >= '2023-02-04' and date < '2023-02-07')
AND (name = 'apple' )
答案1
得分: 1
在ClickHouse中，您可以使用length函数来获取列值的字节数。length函数返回字符串（UTF-8编码）中的字节数或数组中的元素数。
要在SQL查询中获取“value”列的字节数，您可以在SELECT子句中使用length函数。下面是如何执行的示例：
SELECT length(value) AS value_size_bytes, name
FROM stage.log
WHERE date >= '2023-02-04' AND date < '2023-02-07'
AND name = 'apple';
英文:
In ClickHouse, you can use the length function to get the size in bytes of a column value. The length function returns the number of bytes in a string (UTF-8 encoded) or the number of elements in an array.
To obtain the size in bytes for the 'value' column in your SQL query, you can use the length function in the SELECT clause. Here's how you can do it:
SELECT length(value) AS value_size_bytes, name
FROM stage.log
WHERE date >= '2023-02-04' AND date < '2023-02-07'
AND name = 'apple';
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