Best answer: How do I truncate a view in MySQL?

Can we use truncate in view?

You can use the Delete statement with the indexed views. You cannot use the truncate command with the indexed views.

How does truncate work in MySQL?

The TRUNCATE statement in MySQL removes the complete data without removing its structure. It is a part of DDL or data definition language command. Generally, we use this command when we want to delete an entire data from a table without removing the table structure.

How do I truncate a column in MySQL?

MySQL TRUNCATE TABLE

  1. TRUNCATE [TABLE] table_name; …
  2. CREATE TABLE books ( id INT AUTO_INCREMENT PRIMARY KEY, title VARCHAR(255) NOT NULL ) ENGINE=INNODB; …
  3. CALL load_book_data(10000); …
  4. SELECT * FROM books; …
  5. TRUNCATE TABLE books;

How do I truncate a view in hive?

Truncating a table in Hive is indirectly removing the files from the HDFS as a table in Hive is just a way of reading the data from the HDFS in the table or structural format. The general format of using the Truncate table command is as follows: TRUNCATE TABLE table_name [PARTITION partition_spec];

How do I TRUNCATE a view?

Your approach (using special stored procedures) is the only way the do it because TRUNCATE TABLE (Transact-SQL) only works on tables, not views. I guess you have a specific reason (faster and uses fewer system and transaction log resources) to use TRUNCATE over DELETE, since you have the DELETEs working on the views.

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How do you TRUNCATE a snowflake view?

Snowflake no longer supports truncation of materialized views. If you have an existing materialized view that you want to truncate but not drop, the closest alternative is: CREATE OR REPLACE MATERIALIZED VIEW <name> COPY GRANTS

Is truncate faster than delete?

TRUNCATE is faster than DELETE , as it doesn’t scan every record before removing it. TRUNCATE TABLE locks the whole table to remove data from a table; thus, this command also uses less transaction space than DELETE .

Is delete DDL or DML?

DROP and TRUNCATE are DDL commands, whereas DELETE is a DML command. DELETE operations can be rolled back (undone), while DROP and TRUNCATE operations cannot be rolled back.

Is Alter DDL or DML?

Examples of DDL include CREATE , DROP , ALTER , etc. The changes that are caused by issuing DDL commands cannot be rolled back. DML – which stands for Data Manipulation Language which lets you run select, insert, update and delete queries.

How do I truncate a column?

DROP Column in SQL

ALTER TABLE tableName DROP COLUMN columnName ; ALTER TABLE tableName DROP COLUMN columnName ; Example 1: Let us DROP the gender column from our DataFlair_info database. We can see the gender column is no longer available in our database.

What is commit in mysql?

A COMMIT means that the changes made in the current transaction are made permanent and become visible to other sessions. A ROLLBACK statement, on the other hand, cancels all modifications made by the current transaction. Both COMMIT and ROLLBACK release all InnoDB locks that were set during the current transaction.

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What is difference between drop and truncate?

1. The DROP command is used to remove table definition and its contents. Whereas the TRUNCATE command is used to delete all the rows from the table.

What happens if we truncate external table in Hive?

TRUNCATE: used to truncate all the rows, which can not even be restored at all, this actions deletes data in Hive meta store. DROP: it drops the table along with the data associated with Hive Meta store.