SELECT Syntax
Last updated: 2024-01-20 17:25:15
The
SELECT statement is used to select data from a table. It selects eligible data from the current log topic by default.Syntax Format
* | SELECT [Column name(KEY)]
Syntax Example
Select values with columns (KEY) being
remote_addr and method from the log data:* | SELECT remote_addr, method
Select all columns (KEY) from the log data:
* | SELECT *
SELECT can also be followed by arithmetic expressions; for example, you can query the download speed of log data:Download speed (
speed) = total number of bytes sent (body_bytes_sent) / request time (request_time)* | SELECT body_bytes_sent / request_time AS speed
Column Naming Conventions
In SQL specifications, a column name consists of letters, digits, and underscores and starts with a letter, such as
remote_addr. If a field in a log has a non-compliant name, you need to surround the name by "". You can also specify an alias for the field with AS syntax in SQL.If a log field is named
remote_addr, which conforms to SQL's column naming conventions, it can be queried by SELECT:* | SELECT remote_addr
If a log field is named
__TAG__.pod_label_qcloud-app, which does not conform to SQL's column naming conventions, it needs to be surrounded by "":* | SELECT "__TAG__.pod_label_qcloud-app"
If a log field is named
__TIMESTAMP__, which does not conform to SQL's column naming conventions, it needs to be surrounded by "" and specified with an alias through the AS syntax:* | SELECT "__TIMESTAMP__" AS log_time
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