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- 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
An operator is a reserved word or a character used primarily to specify conditions in a SQL statement and to serve as conjunctions for multiple conditions in a SQL statement.
Mathematical Operators
Mathematical operators are symbols used to process four arithmetic operations. They are the simplest and most commonly used operators, especially for number processing. Almost all number processing involves mathematical operators.
Assume variable
a holds 1 and variable b holds 2, then:Operator | Description | Example |
+ (Addition) | Adds values on either side of the operator. | a + b |
- (Subtraction) | Subtracts the right hand operand from the left hand operand. | a - b |
* (Multiplication) | Multiplies values on either side of the operator. | a * b |
/ (Division) | Divides the left hand operand by the right hand operand. | b / a |
% (Modulus) | Divides the left hand operand by the right hand operand and returns the remainder. | b % a |
Comparison Operators
Comparison operators are used to determine the size relationships of values and support any value type that can be compared, such as int, long, double, and text.
Assume variable
a holds 1 and variable b holds 2, then:Operator | Description | Example |
= | Checks if the values of two operands are equal or not. If yes, the condition is true. | a = b |
!= | Checks if the values of two operands are equal or not. If no, the condition is true. | a != b |
<> | Checks if the values of two operands are equal or not. If no, the condition is true. | a <> b |
> | Checks if the value of the left operand is greater than the value of the right operand. If yes, the condition is true. | a > b |
< | Checks if the value of the left operand is less than the value of the right operand. If yes, the condition is true. | a < b |
>= | Checks if the value of the left operand is greater than or equal to the value of the right operand. If yes, the condition is true. | a >= b |
<= | Checks if the value of the left operand is less than or equal to the value of the right operand. If yes, the condition is true. | a <= b |
IN | The IN operator is used to compare a value with a specified list of values. | status IN (200,206,404) |
NOT IN | The NOT IN operator is used to compare a value with values that are not in a specified list. It is the opposite of the IN operator. | status NOT IN (200,206,404) |
BETWEEN AND | The BETWEEN operator tests if a value is within a specified range (BETWEEN min AND max). | status between 200 AND 400 |
LIKE | The LIKE operator is used to compare a value with a similar value using the wildcard operator. The percent sign (%) represents zero, one, or multiple characters. The underscore (_) represents a single digit or character. | url LIKE '%.mp4' |
IS NULL | The NULL operator compares a value with NULL. If the value is null, the condition is true. | status IS NULL |
IS NOT NULL | The NULL operator compares a value with NULL. If the value is not null, the condition is true. | status IS NOT NULL |
DISTINCT | Syntax: x IS DISTINCT FROM y or x IS NOT DISTINCT FROM y.The DISTINCT operator checks if x equals to y. Unlike <>, it can compare nulls. For more information, see Differences between <> and DISTINCT. | NULL IS NOT DISTINCT FROM NULL |
LEAST | Syntax: LEAST(x, y...).Returns the minimum value among x,y... | LEAST(1,2,3) |
GREATEST | Syntax: GREATEST(x, y...). Returns the maximum value among x,y... | GREATEST(1,2,3) |
ALL | Syntax: x expression operator ALL ( subquery ) Returns true if x meets all conditions. Supported operators are <, >, <=, >=, =, <>, !=. | Example 1: 21 < ALL (VALUES 19, 20, 21) Example 2: * | SELECT 200 = ALL(SELECT status) |
ANY / SOME | Syntax: x expression operator ANY ( subquery ) or x expression operator SOME ( subquery ). Returns true if x meets any condition. Supported operators are <, >, <=, >=, =, <>, !=. | Example 1: 'hello' = ANY (VALUES 'hello', 'world') Example 2: * | SELECT 200 = ANY(SELECT status) |
Differences between <> and DISTINCT:
x | y | x = y | x <> y | x IS DISTINCT FROM y | x IS NOT DISTINCT FROM y |
1 | 1 | true | false | false | true |
1 | 2 | false | true | true | false |
1 | null | null | null | true | false |
null | null | null | null | false | true |
Yes
No
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