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CQL for Astra DB Serverless

  • Overview
    • Cassandra structure
    • About CQL
    • CQL quick reference
    • Known issues
  • Getting started
    • Vector Search Quickstart
    • CQL Quickstart
    • SAI Quickstart
  • Planning
    • Data modeling
      • Data modeling concepts
      • Data modeling analysis
  • Connecting
    • cqlsh (startup options)
      • Accessing data using CQL
        • Starting the standalone cqlsh tool
        • Starting cqlsh
    • Developing
      • Introduction to CQL
      • Managing keyspaces
        • Keyspace concepts
        • Check a keyspace
      • Managing tables
        • Table concepts
        • Data types
        • Create a table
        • Check a table
        • Alter a table
        • Truncate a table
        • Drop a table
      • Managing columns
        • Managing columns
        • Create a table column
        • Check column existence
        • Alter a table column
        • Drop a column
        • User-defined type (UDT) overview
          • Create a user-defined type (UDT)
          • Check for user-defined type (UDT) existence
          • Alter a user-defined type (UDT)
          • Drop a user-defined type (UDT)
      • Indexing Tables
        • Indexing concepts
        • Storage-Attached Indexing (SAI) Overview
          • SAI concepts
          • SAI Quickstart
          • SAI FAQ
          • Create SAI index
          • Alter SAI index
          • Drop SAI index
          • Querying with SAI
          • SAI write path and read path
        • Secondary indexes (2i) overview
          • Secondary index (2i) concepts
          • When to use an index
          • Building and maintaining secondary indexes (2i)
          • Create a secondary index (2i)
            • Create a 2i on a collection column
          • Check secondary index (2i) existence
          • Alter a secondary index (2i)
          • Drop a secondary index (2i)
      • Inserting and updating data
        • Insert simple data
        • Set column
        • List fields
        • Map fields
        • Tuple
        • User-defined type (UDT) column
        • Insert static data
        • UUID and timeuuid column
        • Date column
        • Time column
        • Timestamp column
        • Duration column
        • Update counter
        • Lightweight transactions (LWTs)
        • Inserting JSON formatted values
        • Batching inserts and updates
          • Batching inserts, updates, and deletes
          • Good use of BATCH statement
          • Misuse of BATCH statement
        • Importing data from a CSV file
        • Setting the time-to-live (TTL) for value
          • Inserting, updating, and deleting data
      • Deleting data
        • Deleting values from a column or entire row
        • Expiring data with time-to-live
        • Expiring data with TTL example
      • Querying and retrieving data
        • Using a SELECT statement
        • Restricting queries using WHERE clauses
          • Partition keys
          • Clustering columns
          • Retrieval using the IN keyword
          • Sorting and limiting results
        • Returning data from collection columns
        • Aggregating results
        • Using user-defined functions (UDF)
        • Applying user-defined aggregate (UDA) functions
          • Testing performance impact using tracing
        • Formatting query results as JSON
        • Retrieving the write timestamp
        • Using tracing
          • Tracing performance
        • DSE Search index querying
        • Search index filtering best practices
          • Search index syntax
          • search-index:si-query-syntax.adoc#siIndexedColumns
          • search-index:si-query-syntax.adoc#basicSolrSyntax
          • search-index:si-query-syntax.adoc#queriesJSON
          • search-index:si-query-syntax.adoc#siEscapeCharacters
        • Native CQL search queries
        • Identifying the partition key
        • Filtering on terms
          • Filtering on words, phrases, or substrings
          • Fuzzy search
        • UDT query examples
        • Querying a CQL collection set
        • Using date ranges in solr_query
        • Geospatial queries for Point and LineString
        • Spatial queries with polygons require JTS
        • Using dynamic fields
        • Limiting results and paging
        • Restricted query routing
    • Securing overview
      • Security quickstart
      • Using cqlsh with authentication
      • System tables for authentication and authorization
  • Cycling Examples
    • Setting up the cycling keyspace
    • User-defined types (UDTs)
      • basic_info
      • basic_info_withTTL
      • fullname
      • race
    • User-defined functions (UDFs) and user-defined aggregates (UDAs)
      • flog
      • left
      • average_state
      • average_final
      • Cycling user-defined aggregate team_average
    • Tables
      • birthday_list
      • calendar
      • comments
      • country_flag
      • cyclist_alt_stats
      • cyclist_base
      • cyclist_career_teams
      • cyclist_category
      • cyclist_emails
      • cyclist_expenses
      • cyclist_id
      • cyclist_name
      • cyclist_points
      • cyclist_races
      • cyclist_sponsors
      • cyclist_stats
      • cyclist_teams
      • events
      • popular_count
      • race_sponsors
      • race_starts
      • race_times
      • race_winners
      • rank_by_year_and_name
      • team_average
      • upcoming_calendar
    • Materialized views (MVs)
      • cyclist_by_age-mv
    • Search indexes
      • Search index examples
      • comments search index
    • Access control
      • Cycling internal
    • Cycling queries
      • Aggregating cycling data
    • Reference
      • CQL quick reference
      • Understanding the CQL command syntax
      • Data types
        • Creating a blob column
        • Date, time, and timestamp format
      • Operators
      • CQL native functions
      • CQL native aggregates
      • System and virtual tables
        • System tables
          • Keyspace tables
          • Querying system tables
          • Functions, aggregates, and user types
        • Virtual tables
          • Virtual keyspaces and tables
          • Virtual tables for SAI indexes and SSTables
      • cqlsh (startup options)
        • Configuring a cqlshrc file
        • Starting cqlsh on a search node
      • CQL shell (cqlsh) reference
        • CAPTURE
        • CLEAR
        • CONSISTENCY
        • COPY TO
        • COPY FROM
        • DESCRIBE AGGREGATE
        • DESCRIBE CLUSTER
        • DESCRIBE SCHEMA
        • DESCRIBE FUNCTION
        • DESCRIBE INDEX
        • DESCRIBE KEYSPACE
        • DESCRIBE MATERIALIZED VIEW
        • DESCRIBE SEARCH INDEX
        • DESCRIBE TABLE
        • DESCRIBE TYPE
        • EXECUTE AS
        • EXPAND
        • EXIT
        • LOGIN
        • PAGING
        • SERIAL CONSISTENCY
        • SHOW
        • SOURCE
        • TIMING
        • TRACING
      • CQL commands
        • ALTER TABLE
        • ALTER TYPE
        • ALTER USER (Deprecated)
        • BATCH
        • CREATE AGGREGATE
        • CREATE CUSTOM INDEX
        • CREATE INDEX
        • CREATE TABLE
        • CREATE TYPE
        • CREATE USER (Deprecated)
        • DELETE
        • DROP INDEX
        • DROP TABLE
        • DROP TYPE
        • DROP USER (Deprecated)
        • GRANT
        • INSERT
        • RESTRICT
        • REVOKE
        • SELECT
        • TRUNCATE
        • UNRESTRICT
        • UNRESTRICT ROWS
        • UPDATE
        • USE
  • CQL for Astra DB Serverless
  • Developing
  • Querying and retrieving data
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Querying data

Retrieve data sets from a table using SELECT statements.

Queries

About SELECT statements

Retrieving data from tables.

Setting consistency levels

Set the consistency level to control the accuracy of the data returned by read request.

Restricting queries using WHERE clauses

Describes restrictions of partition and clustering columns in a WHERE clause.

DSE Search index enhancements

DataStax Enterprise supports production-grade implementation of CQL Solr queries in DSE Search.

Returning data from collection columns

How to retrieve data from a collection.

Aggregating results

Using the SELECT command to return data and apply standard aggregate functions.

Using user-defined functions (UDF)

Using the SELECT command to return data and applying a UDF.

Returning the write timestamp

Using the WRITETIME function in a SELECT statement to determine when the date/time that the column was written to the database.

Formatting query results as JSON

Use the SELECT command to return JSON data.

Expiring data with TTL example Using a SELECT statement

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