YDB（Yandex Database）22.2 Documentation
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Selecting data from specific columns
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2022-04-24 19:45:21
Selecting data from specific columns
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Contents
Downloads
Cluster management
System views
Overview
Embedded UI
Hive web-viewer
Charts
Connections overview
Logs
Overview
YDB Monitoring
Kubernetes
Deploying in AWS Elastic Kubernetes Service
Overview
Deploying in Yandex Managed Service for Kubernetes
Use
Manual
Cluster configuration
Local deployment
Maintaining a cluster’s disk subsystem
Disk load balancing
Enabling/disabling SelfHeal
Cluster extension
Enabling/disabling Scrubbing
Moving VDisks
Overview
Updating configurations via CMS
How to stay within the failure model
Methods to free up space on physical devices
Safe restart and shutdown of nodes
Adding storage groups
Updating configuration of the actor system
Concepts
Connecting to and authenticating with a database
Terms and definitions
Data model and schema
Database limits
Transactions
Time to Live (TTL)
Secondary indexes
Serverless and Dedicated operation modes
YDB cluster
Overview
General YDB schema
Disk subsystem of a cluster
Overview
Scan queries
FAQ
YQL
General questions
Errors
Serverless
All questions on one page
Overview
SDK
Getting started
YQL query language
Creating a database
Authentication
Overview
YDB command line interface (CLI)
Useful links
YDB SDK
How to edit the documentation
How to participate in the development of documentation
Creating customized documentation
Structure of subject directories
Overview
Building documentation
Content creation guide
Self-hosted deployment
Minikube
Binary file
Docker
Overview
Manage databases
Backup and recovery
Overview
Diagnostics
Overview
Monitoring
System views
Recommendations
Secondary indexes
Using timeouts
Paginated output
Choosing a primary key for maximum performance
Loading large data volumes
Overview
Reference
CLI
Connecting to and authenticating with a database
Global parameters
Install
Structure of YDB CLI commands
Overview
Service commands
Importing and exporting data
Importing data from the file system
Exporting data to the file system
Overview
File structure of data export
Exporting data to S3
Importing data from S3
Connecting to and authenticating with S3
Information services
Authentication
List of endpoints
Load testing
Overview
Stock load
Managing profiles
Using a profile in requests
Creating a profile
Activated profile
Overview
Deleting a profile
Getting profile information
Operations with data
Query execution plan
Making a DB query
Streaming table reads
Scan queries
Working with the DB schema
Renaming tables
Secondary indexes
Directories
List of objects
Information about the object
SDK
Handling errors in the API
Overview
Install
Authentication
Code recipes
Setting the session pool size
Overview
Running repeat queries
Authentication
Using a token
Anonymous
Overview
Username and password based
Metadata service
Using environment variables
Service account file
Balancing
Prefer the nearest data
Prefer the availability zone
Overview
Random choice
Troubleshooting
Enable tracing in Jaeger
Enable metrics in Prometheus
Overview
Enable logging
Test app
Overview
Python
PHP
Go
C# (.NET)
Node.js
C++
Java
Archive
Go v1
Go v2
YQL
Overview
Built-in functions
For structures
For types
Overview
For dictionaries
For lists
For JSON
Aggregate
C++ libraries
DateTime
Url
Math
Overview
Pcre
Unicode
Ip
Hyperscan
Re2
Digest
Yson
Pire
Histogram
String
Window
Basic
Data types
Containers
Optional
Type casting
Simple
JSON
Text representation of data types
Overview
Special
Syntax
CREATE TABLE
UPSERT
DROP TABLE
Lexical structure
GROUP BY
ALTER TABLE
DECLARE
VALUES
REPLACE
PRAGMA
Unsupported statements
ACTION
JOIN
Overview
UPDATE
FLATTEN
DISCARD
INTO RESULT
INSERT
Expressions
SELECT
DELETE
WINDOW
YQL tutorial
Joining tables with JOIN
Data aggregation
Updating data with UPDATE
Deleting a table
Inserting and updating data with UPSERT
Deleting data
Selecting data from specific columns
Adding data to a table
Sorting and filtering
Inserting and updating data with REPLACE
Inserting data with INSERT
Adding and deleting columns
Overview
Additional selection criteria
Selecting data from all columns
Creating a table
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