- Release Notes and Announcements
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- String Function
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- JSON Functions
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- Reindexing
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- Context Search and Analysis
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- Value Structuring Functions
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- Processing Cases
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- SCF
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- Historical Documentation
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- Introduction
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- Data Types
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- FAQs
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- CLS Policy
- Contact Us
- Glossary
- Release Notes and Announcements
- User Guide
- Product Introduction
- Purchase Guide
- Getting Started
- Operation Guide
- Resource Management
- Permission Management
- Log Collection
- Collection Overview
- Collecting Logs in Self-Built Kubernetes Cluster
- Collecting Syslog
- Collection by LogListener
- Collecting Text Log
- Uploading Log over Kafka
- Uploading Logs via Anonymous Write
- Uploading Logs via Logback Appender
- Uploading Logs via Log4j Appender
- Uploading Log via SDK
- Uploading Log via API
- Importing Data
- Tencent Cloud Service Log Access
- Metric Collection
- Log Storage
- Metric Storage
- Search and Analysis (Log Topic)
- Overview of Search and Analysis
- Syntax and Rules
- Statistical Analysis (SQL)
- Quick Analysis
- SQL Syntax
- SQL Functions
- String Function
- Date and Time Functions
- IP Geographic Function
- URL Function
- Mathematical Calculation Functions
- Mathematical Statistical Function
- General Aggregate Function
- Geospatial Function
- Binary String Function
- Estimation Function
- Type Conversion Function
- Logical Function
- Operators
- Bitwise Operation
- Regular Expression Function
- Lambda Function
- Conditional Expressions
- Array Functions
- Interval-Valued Comparison and Periodicity-Valued Comparison Functions
- JSON Functions
- Window Functions
- Sampling Analysis
- Configuring Indexes
- Reindexing
- Multi-Topic Search
- Context Search and Analysis
- Custom Redirect
- Downloading Log
- Search and Analysis (Metric Topic)
- Dashboard
- Data Processing documents
- Data Processing
- Data Processing Overview
- Creating Processing Task
- Viewing Data Processing Details
- Data Processing Functions
- Function Overview
- Key-Value Extraction Functions
- Enrichment Functions
- Flow Control
- Row Processing Functions
- Field Processing Functions
- Value Structuring Functions
- Regular Expression Processing Functions
- Time Value Processing Functions
- String Processing Functions
- Type Conversion Functions
- Logical and Mathematical Functions
- Encoding and Decoding Functions
- IP Parsing Functions
- Processing Cases
- Scheduled SQL Analysis
- SCF
- Data Processing
- Shipping and Consumption
- Monitoring Alarm
- Historical Documentation
- Practical Tutorial
- Developer Guide
- API Documentation
- History
- Introduction
- API Category
- Making API Requests
- Topic Management APIs
- Log Set Management APIs
- Index APIs
- Topic Partition APIs
- Machine Group APIs
- Collection Configuration APIs
- Log APIs
- Metric APIs
- Alarm Policy APIs
- Data Processing APIs
- Kafka Protocol Consumption APIs
- CKafka Shipping Task APIs
- Kafka Data Subscription APIs
- COS Shipping Task APIs
- SCF Delivery Task APIs
- Scheduled SQL Analysis APIs
- COS Data Import Task APIs
- Data Types
- Error Codes
- FAQs
- CLS Service Level Agreement
- CLS Policy
- Contact Us
- Glossary
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
Yes
No
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