SELECT CURRENT_VERSION(); -- 7.37.1 CREATE TABLE table1(col1 INT, col2 INT); INSERT INTO table1(col1, col2) VALUES (1,10); SELECT * FROM table1; -- COL1 COL2 -- 1 10 Main query: ALTER TABLE IF EXISTS table1 DROP COLUMN IF EXISTS col1; -- Statement executed successfully....
SQLEXPLAINSELECT*FROMmy_tableWHEREcolumn='value'; 1. 2. 使用物化视图(Materialized Views) 你可通过预计算和存储结果来加速复杂的查询。 复制 SQLCREATEMATERIALIZEDVIEWmy_viewASSELECTcolumn1,SUM(column2)FROMmy_tableGROUPBYcolumn1; 1. 2. 3. 仓库的使用情况 检查仓库的使用情况将有助于我们了解当前的性能...
ALTER TABLE , DROP TABLE , SHOW TABLES , DESCRIBE TABLE Syntax CREATE [ OR REPLACE ] [ { [ { LOCAL | GLOBAL } ] TEMP | TEMPORARY | VOLATILE | TRANSIENT } ] TABLE [ IF NOT EXISTS ] <table_name> ( -- Column definition <col_name> <col_type> [ inlineConstraint ] [ NOT NULL ]...
SQLCREATETABLEmy_database.my_schema.my_table(idINTAUTOINCREMENT,nameSTRING,created_atTIMESTAMP_LTZDEFAULTCURRENT_TIMESTAMP,PRIMARYKEY(id)); 1. 2. 3. 4. 5. 6. 7. 修改表 添加列或更改表结构可以通过ALTER TABLE命令来完成: 复制 SQLALTERTABLEmy_database.my_schema.my_tableADDCOLUMNemailSTRING; ...
ALTER TABLE [TABLE_NAME] ALTER [COLUMN_NAME] 设置数据类型为 NUMBER;返回:SQL 编译错误:无法将列 [COLUMN_NAME] 从类型 VARCHAR(16777216) 更改为 NUMBER(38,0) 还有ALTER TABLE [TABLE_NAME] ALTER [COLUMN_NAME] 设置数据类型 VARCHAR(500); 返回:SQL 编译错误:无法将列 [COLUMN_NAME] 从类型 VARCHAR...
对于我拥有的模式和表名,我可以在单个查询中检查列是否与列表中的列名匹配,只需删除 假设要删除的列列表是 Drop_col = ['AB',' BC', FG', 'TR'] 但是我的TABLE1在列列表中只有'BC','TR‘ Query = ALTER TABLE SCHEMA_NAME.TABLE1 DROP COLUMN IN ({Drop}).format (Drop = Drop_col) 就像这样?
],"typeProperties": {"source": {"type":"SnowflakeV2Source","sqlReaderQuery":"SELECT * FROM MYTABLE","exportSettings": {"type":"SnowflakeExportCopyCommand","additionalCopyOptions": {"MAX_FILE_SIZE":"64000000","OVERWRITE":true},"additionalFormatOptions": {"DATE_FORMAT":"'MM/DD/YYYY'"...
Re-arrange columns by drag and drop Yes Yes Multi column sort by clicking column header Yes Yes One-click open of grid data in native spreadsheet tool (Excel, Numbers, LibreOffice, etc) Yes No Copy column name Yes Yes Copy selection Yes Yes Quick filter with range ...
SELECT Specific Columns in a Table Commas in the Front or Back? Place your Commas in front for better Debugging Capabilities Sort the Data with the ORDER BY Keyword Use a Column Name or Number in an ORDER BY Statement Two Examples of ORDER BY using Different Techniques ...
As such, the dbt-managed table should always be in a mostly clustered state.Using cluster_byThe cluster_by config accepts either a string, or a list of strings to use as clustering keys. The following example will create a sessions table that is clustered by the session_start column....