CQL table properties and descriptions of the syntax. Table properties tune data handling, including I/O operations, compression, and compaction. Set table properties in the following CQL requests: CREATE TABLE ALTER TABLE CREATE MATERIALIZED VIEW ...
CQL 查詢,請參考 CQL 參考資料。 否(如果在資料集中已指定「tableName」和「keyspace」)。 一致性層級 一致性層級可指定必須先有多少複本回應讀取要求,才會將資料傳回用戶端應用程式。 Cassandra 會檢查要讓資料滿足讀取要求的指定複本數目。 如需詳細資訊,請參閱 設定資料一致性。允許的值為:ONE、TWO、THREE、...
cqlsh> help Documented shell commands:===CAPTURE COPY DESCRIBE EXPAND PAGING SOURCE CONSISTENCY DESC EXIT HELP SHOW TRACING.CQL help topics:===ALTER CREATE_TABLE_OPTIONS SELECTALTER_ADD CREATE_TABLE_TYPES SELECT_COLUMNFAMILY ALTER_ALTER CREATE_USER SELECT_EXPR ALTER_DROP DELETE SELECT_LIMIT ALTER_RE...
用于创建和运行应用的 CQL 命令 创建密钥空间 SQL复制 CREATEKEYSPACEIFNOTEXISTSuprofileWITHREPLICATION= {'class':'NetworkTopologyStrategy','datacenter1':1}; 创建表 SQL复制 CREATETABLEIFNOTEXISTSuprofile.user (user_idintPRIMARYKEY, user_nametext, user_bcitytext); ...
optional. indicates that this model is only intended to be used as a base class for other models. you can’t create tables for abstract models, but checks around schema validity are skipped during class construction. __table_name__ = none ¶ optional. sets the name of the cql table ...
Cassandra is a nonrelational data store. You organize Cassandra data into keyspaces and tables. Keyspaces are collections of tables that you can use to represent table groupings, such as different system components, applications, or environments. Each table in Cassandra has a schema. Schemas define...
Cassandra Query Language (CQL) v3.4.3 CQL Syntax Preamble Conventions Identifiers and keywords Constants Comments Statements Prepared Statement Data Definition CREATE KEYSPACE USE ALTER KEYSPACE DROP KEYSPACE CREATE TABLE ALTER TABLE DROP TABLE TRUNCATE ...
Examples Creating an index on a clustering column Define a table having acomposite partition key, and then create an index on a clustering column. CREATETABLEmykeyspace.users( userIDuuid, fnametext, lnametext, emailtext, addresstext,
然后使用它在 Azure Cosmos DB 上执行各种操作(operations\setup.go 的一部分),并从 keyspace 和table 创建开始。顾名思义,DropKeySpaceIfExists 函数只在 keyspace 存在时才会将其删除。Go 复制 const dropKeyspace = "DROP KEYSPACE IF EXISTS %s" func DropKeySpaceIfExists(keyspace string, session *gocql....
SELECT*FROMmy_tableWHEREcol1=5ANDcol2='Bob'ALLOW FILTERING ; Be aware that usingALLOW FILTERINGcan result in inconsistent performance, especially with large, and multi-partitioned tables. Try it Create your own CQL queries to find the following from yourbook_awardstable: ...