- What's New
- Function Overview
- Service Overview
- Billing
- Getting Started
-
User Guide
- Granting LTS Permissions to IAM Users
- Purchasing LTS Resource Packages
- Log Management
-
Log Ingestion
- Overview
-
Using ICAgent to Collect Logs
- Overview
- Installing ICAgent (Intra-Region Hosts)
- Installing ICAgent (Extra-Region Hosts)
- Managing ICAgent
- Managing Host Groups
- Ingesting BMS Text Logs to LTS
- Ingesting CCE Application Logs to LTS
- Ingesting ECS Text Logs to LTS
- Ingesting ServiceStage Containerized Application Logs to LTS
- Ingesting ServiceStage Cloud Host Logs to LTS
- Ingesting Self-Built Kubernetes Application Logs to LTS
- Setting ICAgent Structuring Parsing Rules
-
Ingesting Cloud Service Logs to LTS
- Overview
- Ingesting AOM Logs to LTS
- Ingesting APIG Logs to LTS
- Ingesting CBH Logs to LTS
- Ingesting CFW Logs to LTS
- Ingesting CTS Logs to LTS
- Ingesting DDS Logs to LTS
- Ingesting DMS for Kafka Logs to LTS
- Ingesting DRS Logs to LTS
- Ingesting GaussDB(DWS) Logs to LTS
- Ingesting ELB Logs to LTS
- Ingesting Enterprise Router Logs to LTS
- Ingesting FunctionGraph Logs to LTS
- Ingesting GaussDB Logs to LTS
- Ingesting GES Logs to LTS
- Ingesting TaurusDB Logs to LTS
- Ingesting GeminiDB Logs to LTS
- Ingesting GeminiDB Mongo Logs to LTS
- Ingesting GeminiDB Cassandra Logs to LTS
- Ingesting IoTDA Logs to LTS
- Ingesting ModelArts Logs to LTS
- Ingesting MRS Logs to LTS
- Ingesting RDS for MySQL Logs to LTS
- Ingesting RDS for PostgreSQL Logs to LTS
- Ingesting RDS for SQL Server Logs to LTS
- Ingesting ROMA Connect Logs to LTS
- Ingesting SMN Logs to LTS
- Ingesting SecMaster Logs to LTS
- Ingesting OBS Files to LTS (Beta)
- Ingesting VPC Logs to LTS
- Ingesting WAF Logs to LTS
- Using APIs to Ingest Logs to LTS
- Ingesting Logs to LTS Across IAM Accounts
- Using Kafka to Report Logs to LTS
- Using Flume to Report Logs to LTS
- Log Search and Analysis
-
Log Visualization
- Overview
- Visualizing Logs in Statistical Charts
-
Visualizing Logs in Dashboards
- Creating a Dashboard
- Adding a Dashboard Filter
-
Dashboard Templates
- APIG Dashboard Templates
- CCE Dashboard Templates
- CDN Dashboard Templates
- CFW Dashboard Templates
- CSE Dashboard Templates
- DCS Dashboard Template
- DDS Dashboard Template
- DMS Dashboard Template
- DSL Dashboard Template
- ER Dashboard Template
- METRIC Dashboard Template
- Nginx Dashboard Templates
- VPC Dashboard Template
- WAF Dashboard Templates
- Log Alarms
- Log Transfer
- Log Processing
- Configuration Center
- Querying Real-Time LTS Traces
-
Best Practices
- Overview
-
Log Ingestion
- Collecting Logs from Third-Party Cloud Vendors, Internet Data Centers, and Other Huawei Cloud Regions to LTS
- Collecting Kubernetes Logs from Third-Party Clouds, IDCs, and Other Huawei Cloud Regions to LTS
- Collecting Syslog Aggregation Server Logs to LTS
- Importing Logs of Self-built ELK to LTS
- Using Flume to Report Logs to LTS
- Collecting Zabbix Data Through ECS Log Ingestion
- Collecting Logs from Multiple Channels to LTS
- Log Search and Analysis
- Log Transfer
- Billing
- Developer Guide
-
API Reference
- Before You Start
- API Overview
- Calling APIs
- API Calling Examples
- Examples
-
APIs
- Host Group Management
- Log Group Management
- Log Stream Management
- Log Management
- Log Ingestion
- Log Transfer
- Log Collection Beyond Free Quota
- Cloud Log Structuring
- Container Log Ingestion from AOM to LTS
- Alarm Topics
- Message Template Management
- SQL Alarm Rules
- Keyword Alarm Rules
- Alarm List
- Tag Management
- Dashboard Management
- Log Charts
- Quick Search
- Multi-Account Log Aggregation
- Permissions Policies and Supported Actions
- Appendix
- SDK Reference
-
FAQs
- Overview
- Consultation
- Log Management
-
Host Management
- What Do I Do If ICAgent Installation Fails in Windows and the Message "SERVICE STOP" Is Displayed?
- What Do I Do If ICAgent Upgrade Fails on the LTS Console?
- What Do I Do If I Could Not Query New Logs on LTS?
- What Do I Do If ICAgent Restarts Repeatedly After Being Installed?
- What Do I Do If ICAgent Is Displayed as Offline on the LTS Console After Installation?
- What Do I Do If I Do Not See a Host with ICAgent Installed on the LTS Console?
- How Do I Create a VPC Endpoint on the VPCEP Console?
- How Do I Obtain an AK/SK Pair?
- How Do I Install ICAgent by Creating an Agency?
-
Log Ingestion
- What Do I Do If LTS Cannot Collect Logs After I Configure Host Log Ingestion?
- Will LTS Stop Collecting Logs After the Free Quota Is Used Up If I Disable "Continue to Collect Logs When the Free Quota Is Exceeded" in AOM?
- What Do I Do If the CPU Usage Is High When ICAgent Is Collecting Logs?
- What Kinds of Logs and Files Does LTS Collect?
- How Do I Disable the Function of Collecting CCE Standard Output Logs to AOM on the LTS Console?
- What Log Rotation Scheme Should I Use for ICAgent to Collect Logs?
- Does LTS Use the Log4j Plug-in to Report Logs?
- How Long Does It Take to Generate Logs After Configuring Log Ingestion?
- What Do I Do If LTS Cannot Collect Logs After I Configure Log Ingestion with ICAgent?
- Log Search and Analysis
-
Log Transfer
- Does LTS Delete Logs That Have Been Transferred to OBS Buckets?
- What Are the Common Causes of LTS Log Transfer Abnormalities?
- How Do I Transfer CTS Logs to an OBS Bucket?
- What Do I Do If I Cannot View Historical Data in an OBS Bucket After Transferring Data from LTS to OBS?
- What Do I Do If I Cannot Find a New Partition in a DLI Table After Logs Are Transferred to DLI?
-
More Documents
- User Guide (ME-Abu Dhabi Region)
- API Reference (ME-Abu Dhabi Region)
- User Guide(Paris Regions)
- API Reference(Paris Regions)
- User Guide (Kuala Lumpur Region)
- API Reference (Kuala Lumpur Region)
- User Guide (Ankara Region)
-
API Reference (Ankara Region)
- Before You Start
- Calling APIs
- API Calling Examples
- APIs
- Permissions and Supported Actions
- Appendix
- Change History
- Videos
- General Reference
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Mathematical Functions
Description
Mathematical functions are one type of scalar functions. They support only numeric fields and can be used to round values, obtain absolute values, and perform modulo operations. For details, see Table 1.
In mathematical operations, if the operands involved in an expression are all integers, SQL uses integer operations. Otherwise, SQL switches to floating-point operations. You can force the switch by converting one of the operands to float type, and the runtime SQL extends the 32-bit floats in most expressions to 64-bit floats.
Syntax
SELECT ABS(fieldname1) AS fieldname1_abs
Mathematical Function Statements
Statement |
Description |
Example |
---|---|---|
ABS(expr) |
Returns the absolute value. |
SELECT ABS(fieldname1) |
CEIL(expr) |
Rounds up to the nearest integer. |
SELECT CEIL(fieldname1) |
FLOOR(expr) |
Rounds down to the nearest integer. |
SELECT FLOOR(fieldname1) |
TRUNCATE(expr, digits) |
Truncates expr to a specified digits. If the number is negative, many positions to the left of the decimal point are truncated. If not specified, the number is zero by default. |
SELECT TRUNCATE(fieldname1, 2) |
ROUND(expr, digits) |
Rounds expr to a specified number of decimal places. The result is of the same type as that of expr. expr can be an integer or a floating point number, but digits must be an integer. If digits is not specified, the default value 0 is used. If digits is a negative number, the value of expr is rounded off. If expr is a non-numeric value, it will be converted to 0. If expr is an infinite number, it is converted to a number with a finite number of digits of the closest double type. |
SELECT ROUND(fieldname1, 2) |
x + y |
Addition. |
SELECT fieldname1 + fieldname2 |
x - y |
Subtraction. |
SELECT fieldname1 - fieldname2 |
x * y |
Multiplication. |
SELECT fieldname1 * fieldname2 |
x / y |
Division. |
SELECT fieldname1 / fieldname2 |
MOD(x, y) |
Modulo. |
SELECT MOD(fieldname1, fieldname2) |
LN(expr) |
Logarithm (base: e). |
SELECT ln(expr) |
LOG10(expr) |
Logarithm (base 10). |
SELECT LOG10(expr) |
POWER(expr,power) |
Power of expr. |
SELECT POWER(expr ,2) |
SQRT(expr) |
Square root of expr. |
SELECT SQRT(expr) |
SIN(expr) |
Sine. |
SELECT SIN(expr) |
COS(expr) |
Cosine. |
SELECT COS(expr) |
TAN(expr) |
Tangent. |
SELECT TAN(expr) |
COT(expr) |
Cotangent. |
SELECT COT(expr) |
ASIN(expr) |
Arcsine. |
SELECT ASIN(expr) |
ACOS(expr) |
Arc cosine. |
SELECT ACOS(expr) |
ATAN(expr) |
Inverse tangent. |
SELECT ATAN(expr) |
Examples
ACOS(expr)
Calculates the arccosine of a parameter value. y = arccosx, where x is within [-1,1].
- Example field
- Query and analysis statement
select ACOS(x)
- Query and analysis result
Table 2 Query and analysis result x
EXPR$1
0.5
1.0471975511965979
ATAN(expr) function
Calculates the arctangent of a parameter value. y = arctanx, where x is R.
- Example field
- Query and analysis statement
select ATAN(X)
- Query and analysis result
Table 3 Query and analysis result x
EXPR$1
0.5
1.0471975511965979
ATAN2(expr)
Returns the angle θ from rectangular coordinates (x, y) to polar coordinates (r, θ).
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