Tutorial by Examples: dropping

MySQL3.19 DROP TABLE IF EXISTS MyTable; PostgreSQL8.x DROP TABLE IF EXISTS MyTable; SQL Server2005 If Exists(Select * From Information_Schema.Tables Where Table_Schema = 'dbo' And Table_Name = 'MyTable') Drop Table dbo.MyTable SQLite3.0 DROP TABLE IF EXI...

When creating a DataFrame None (python's missing value) is converted to NaN (pandas' missing value): In [11]: df = pd.DataFrame([[1, 2, None, 3], [4, None, 5, 6], [7, 8, 9, 10], [None, None, None, None]]) Out[11]: 0 1 2 3 0 1.0 2.0 NaN 3.0 1 ...

DROP INDEX ix_cars_employee_id ON Cars; We can use command DROP to delete our index. In this example we will DROP the index called ix_cars_employee_id on the table Cars. This deletes the index entirely, and if the index is clustered, will remove any clustering. It cannot be rebuilt without rec...

generate sample DF In [39]: df = pd.DataFrame(np.random.randint(0, 10, size=(5, 6)), columns=['a10','a20','a25','b','c','d']) In [40]: df Out[40]: a10 a20 a25 b c d 0 2 3 7 5 4 7 1 3 1 5 7 2 6 2 7 4 9 0 8 7 3 5 8 8 9 6 8 4 8 1 ...

If index name is known, db.collection.dropIndex('name_of_index'); If index name is not known, db.collection.dropIndex( { 'name_of_field' : -1 } );

-- Create and drop a view in the current database. CREATE VIEW few_rows_from_t1 AS SELECT * FROM t1 LIMIT 10; DROP VIEW few_rows_from_t1; -- Create and drop a view referencing a table in a different database. CREATE VIEW table_from_other_db AS SELECT x FROM db1.foo WHERE x IS NOT NULL; DROP V...

DROP SCHEMA dvr

The following methods can be used to drop an Item somewhere in the world: Item dropItem(Location loc, ItemStack is); Item dropItemNaturally(Location loc, ItemStack is); dropItem means dropping an Item exactly at the location, returning an Item object. dropItemNaturally means dropping the Item ...

Temp tables must have unique IDs (within the session, for local temp tables, or within the server, for global temp tables). Trying to create a table using a name that already exists will return the following error: There is already an object named '#tempTable' in the database. If your query pro...