The codeaims to find columnswith more than 30% null values and drop them from the DataFrame. Let’s go through each part of the code in detail to understand what’s happening: from pyspark.sql import SparkSession from pyspark.sql.types import StringType, IntegerType, LongType import pyspark...
Comparing TRUNCATE TABLE, DELETE, and DROP TABLE in SQL What Is the DELETE Statement in SQL? See also: How to Remove a Primary Key in SQL How to remove a unique constraint in SQL? How to Delete a Column in SQL How to Delete a Foreign Key Constraint in SQL How to Delete a Row in...
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This article discusses the“DROP IF EXISTS”statement available in SQL Server 2016 and later versions.“IF EXITS”is the latest optional clause added in the existing DROP statement in SQL Server 2016 and later versions. Essentially, the“DROP IF EXISTS”option is used when it is necessary to c...
In rare situations like database level permission issues, you may need to drop all the tables from a SQL Server database and recreate them.
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Older versions of SQL Server does not have DIY or DROP IF EXISTS functionality. So, we have to use the old technique of checking for the object using OBJECT_ID. Let’s see how to use it. 1 2 3 4 5 6 7 IF OBJECT_ID('tempdb..#TempTable') IS NOT NULL ...
INSERT INTO STUDENTS VALUES (9,'Rahul',10,'SCIENCE'); After inserting the data, we can see the data inserted into the table below: SELECT * FROM STUDENTS; How to Drop Table in SQL? The syntax to drop a table is as below: DROP TABLE table_name; ...
MySQL installed and secured on the server, as outlined inHow To Install MySQL on Ubuntu 20.04. This guide was verified with a non-root MySQL user, created using the process described inStep 3. Note: Please note that many RDBMSs use their own unique implementations of SQL. Although the comma...
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