-- single columnALTERTABLEempl_infomodifycolumnempl_idunsetmasking policy;-- multiple columnsALTERTABLEempl_infoMODIFYCOLUMNempl_idUNSETMASKING POLICY,COLUMNempl_dobUNSETMASKING POLICY;
tableColumnAction ::= { ADD [ COLUMN ] [ IF NOT EXISTS ] <col_name> <col_type> [ { DEFAULT <default_value> | { AUTOINCREMENT | IDENTITY } /* AUTOINCREMENT (or IDENTITY) is supported only for */ /* columns with numeric data types (NUMBER, INT, FLOAT, etc.). */ /* Also, ...
系统函数: system$clustering_depth: 返回表平均的ClusteringDepth,可以指定columns参数 system$clustering_information: 返回表相关clustering 信息,包含average_overlaps,average_depth,partition_depth_histogram等 锁优化 Selection 和 Merge 进行不会对原始数据持有锁,也就是说在这两个过程中都不会卡主用户数据的查询和插...
在Snowflake文档中,他们说-“使用以下ALTER TABLE语法更改现有的外部表以添加或删除列: add columns: ALTER TABLE…ADD COLUMN。当我尝试向外部表添加列时,出现以下错误-“外部表列TEST_COL必须有一个定义表达式”。我使用以下命令添加< 浏览35提问于2020-01-08得票数 1 回答已采纳 点击加载更多 扫码 添加站长...
Adding columns or altering table structures can be accomplished with theALTER TABLEcommand: SQL ALTER TABLE my_database.my_schema.my_table ADD COLUMN email STRING; Removing Tables To drop a table, use the commandDROP TABLE: SQL DROP TABLE my_database.my_schema.my_table; ...
alter table table1 add column col3 varchar not null constraint uniq_col3 unique not enforced; The following example will create a parent table with a Snowflake Primary Key constraint and another table with a foreign key constraint that points to the same columns as the first table’s primary...
Views including the columns Stored procedures including the parameter dataset and result set Functions including the parameter dataset Pipes Stages Streams including the columns Tasks Sequences Fetching static lineage on assets relationships among tables, views, streams, and stored procedures. ...
Hackolade was specially adapted to support the data modeling of Snowflake, including schemas, tables and views, plus the generation of DDL Create Table syntax. In particular, Hackolade has the unique ability to model complex semi-structured objects stored in columns of the VARIANT data type. ...
演變冰山表模式 ALTER TABLE ADD COLUMNS ALTER TABLE DROP COLUMN ALTER TABLE CHANGE COLUMN SHOW COLUMNS 其他Iceberg DDL 操作 優化冰山表 支援的資料類型 其他資源 安全 資料保護 靜態加密 加密存放在 Amazon S3 中的 Athena 查詢結果 根據Amazon S3 中的加密資料集建立資料表 傳輸中加密 金鑰管理 網際網路流量...
data type(one ofSnowflake data types); you can also use the select box in the table header to bulk set the type for all columns. Setting the data type toIGNOREmeans that column will not be present in the destination table. nullable; when checked, the column will be marked as nullable ...