what is the difference between delete and truncate sql?
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Delete and truncate both commands can be used to delete data of the table. Delete is a DML command whereas truncate is DDL command. Truncate can be used to delete the entire data of the table without maintaining the integrity of the table. On the other hand , delete statement can be used for deleting the specific data.
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While T-SQL is an extension to SQL, SQL is a programming language. T-SQL contains procedural programming and local variable, while SQL does not. T-SQL is proprietary, while SQL is an open format.
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There is no before-undelete event in Salesforce Triggers because, an Update or Insert can have a Before functionality as the record exists. Whereas there is no Record before deleting the Actual record. Hence only after deleting, we can have the Undelete event, whereas every record merely exists before deleting.
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ON DELETE CASCADE : SQL Server deletes the rows in the child table that is corresponding to the row deleted from the parent table. ON DELETE SET NULL : SQL Server sets the rows in the child table to NULL if the corresponding rows in the parent table are deleted.
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SQL is used in the accessing, updating, and manipulation of data in a database while MySQL is an RDBMS that allows keeping the data that exists in a database organized. SQL is a Structured Query Language and MySQL is a RDBMS to store, retrieve, modify and administrate a database.
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Key Difference: Erase refers to the ability to remove something from a certain place. Once it is erased, it is gone from existence. Delete refers to removing files from one place, but it is still there in another place. ... Delete refers to removing files from one place, but it is still there in another place.
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Delete is more for technology, such as software. Eliminate sounds like a game show, and erase sounds like fixing a math homework error.
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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.
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Use the DELETE FROM statement to delete one or more rows from a table. Use the WHERE clause to specify which rows to be deleted. Use the RETURNING clause to return the deleted rows.
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As verbs the difference between omit and delete is that omit is to leave out or exclude while delete is to remove, get rid of or erase, especially written or printed material, or data on a computer.
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Usage. The main difference between variable and parameter in SQL is their usage. A variable in SQL helps to hold a single data value of a specific type while a parameter in SQL helps to exchange data among functions and stored procedures.
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If a limit count is given, no more than that many rows will be returned (but possibly less, if the query itself yields less rows). LIMIT ALL is the same as omitting the LIMIT clause. OFFSET says to skip that many rows before beginning to return rows.
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DELETE deletes records one by one and makes an entry for each and every deletion in the transaction log, whereas TRUNCATE de-allocates pages and makes an entry for de-allocation of pages in the transaction log. There is also a lot of misconception among people about rolling back after a TRUNCATE or DELETE.
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TRUNCATE removes all rows from a table. The operation cannot be rolled back and no triggers will be fired. ... DROP and TRUNCATE are DDL commands, whereas DELETE is a DML command. Therefore DELETE operations can be rolled back (undone), while DROP and TRUNCATE operations cannot be rolled back.
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['Specify the name of the database that you want to delete after the DROP DATABASE clause.', 'Use IF EXISTS to prevent an error from removing a non-existent database. PostgreSQL will issue a notice instead.']
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Four kinds of action queries are: Append Query – takes the set results of a query and "appends" (or adds) them to an existing table. Delete Query – deletes all records in an underlying table from the set results of a query. Make Table Query – as the name suggests, it creates a table based on the set results of a query.
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"delete" will send the data to recycle bin whereas "shift delete" will delete the data permanently from the system. See, both of them use to delete the file. But the slightest difference is delete send the file to recycle bin and shift Delete permanently delete the file.