Keyword Analysis & Research: sqlite delete data from table

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Frequently Asked Questions

Why does SQLite delete from main_table have no triggers?

When the WHERE is omitted from a DELETE statement and the table being deleted has no triggers, SQLite uses an optimization to erase the entire table content without having to visit each row of the table individually. This "truncate" optimization makes the delete run much faster. "DELETE FROM MAIN_TABLE" maybe is not enough.

How do I add or delete columns from an existing table in SQLite?

(11) How do I add or delete columns from an existing table in SQLite. SQLite has limited ALTER TABLE support that you can use to add a column to the end of a table or to change the name of a table. If you want to make more complex changes in the structure of a table, you will have to recreate the table.

How to drop multiple tables in SQLite?

SQLite allows you to drop only one table at a time. To remove multiple tables, you need to issue multiple DROP TABLE statements. If you remove a non-existing table, SQLite issues an error. If you use IF EXISTS option, then SQLite removes the table only if the table exists, otherwise, it just ignores the statement and does nothing.

How to remove rows from a table in SQL Server?

First, specify the name of the table which you want to remove rows after the DELETE FROM keywords. Second, add a search condition in the WHERE clause to identify the rows to remove. The WHERE clause is an optional part of the DELETE statement. If you omit the WHERE clause, the DELETE statement will delete all rows in the table.

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