Apache Cassandra™ 10 Documentation February 16, 2012for a set of column families. Defining Keyspaces About Keyspaces 47 Data Definition Language (DDL) commands for defining and altering keyspaces are provided in the various client interfaces, such as See Getting Started Using the Cassandra CLI and Getting Started with CQL for more information on DDL commands for Cassandra. About Column Families When comparing Cassandra to a relational database, SSTables on disk. Once an SSTable is written, it is immutable (the file is not updated by further DML operations). This means that a deleted column is not removed immediately. Instead a marker called a0 码力 | 141 页 | 2.52 MB | 1 年前3
DBeaver Lite User Guide v24.2.eaadding connection URL Templates Advanced settings Main parameters Queries -Custom driver queries DDL - generation options Formatting - SQL values formats Summary You can use a pre-configured database 'ALTER TABLE DROP (column-name)' instead of standard syntax Use legacy SQL dialect for DDL Use legacy SQL dialect for DDL Add COLUMN keyword in alter table query Add COLUMN keyword after keyword ADD and columns Date format Format pattern for date columns Time format Format pattern for time columns DDL - generation options Formatting - SQL values formats Summary DBeaver Lite User Guide 24.2.ea. Page0 码力 | 1010 页 | 79.48 MB | 1 年前3
DBeaver Ultimate User Guide v24.2.eaadding connection URL Templates Advanced settings Main parameters Queries -Custom driver queries DDL - generation options Formatting - SQL values formats Summary You can use a pre-configured database 'ALTER TABLE DROP (column-name)' instead of standard syntax Use legacy SQL dialect for DDL Use legacy SQL dialect for DDL Add COLUMN keyword in alter table query Add COLUMN keyword after keyword ADD and columns Date format Format pattern for date columns Time format Format pattern for time columns DDL - generation options Formatting - SQL values formats Summary DBeaver Ultimate User Guide 24.2.ea0 码力 | 1171 页 | 94.65 MB | 1 年前3
DBeaver User Guide v24.2.eaadding connection URL Templates Advanced settings Main parameters Queries -Custom driver queries DDL - generation options Formatting - SQL values formats Summary You can use a pre-configured database 'ALTER TABLE DROP (column-name)' instead of standard syntax Use legacy SQL dialect for DDL Use legacy SQL dialect for DDL Add COLUMN keyword in alter table query Add COLUMN keyword after keyword ADD and columns Date format Format pattern for date columns Time format Format pattern for time columns DDL - generation options Formatting - SQL values formats Summary DBeaver User Guide 24.2.ea. Page 2050 码力 | 1171 页 | 94.79 MB | 1 年前3
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