delete from emp where emp_name like "%Jay%" At that time we can use the following statement. Suppose we need to delete an employee whose name contains Jay. The end result of the above statement as shown in below screenshot.table In above example, we use create table statement to create a new table name as emp with different attributes such as emp_id with integer data type and primary key constraint, emp_name with text data type and not null constraint, emp_dept with text data type and not null constraint and emp_salary with text data type and not null constraint as shown in above statement.
create table emp (emp_id integer primary key, emp_name text not null, emp_dept text not null, emp_salary text not null) Now let’s see the different examples of SQLite delete as follows.įirst, we need to create a new table by using the following statement as follows. In the event that there are not as many as N lines staying subsequent to considering the OFFSET clause, or assuming the LIMIT proviso assessed to a negative worth, all leftover columns are erased. The principal M lines, where M is the worth found by assessing the OFFSET statement articulation, are skipped, and the accompanying N, where N is the estimation of the LIMIT specified expression, are erased. In the event that there is no OFFSET clause, or the determined whole number worth is negative, the powerful OFFSET value is zero.Īssuming the DELETE statement has an ORDER BY clause all columns that would be erased without the LIMIT provision are arranged by the ORDER BY. Once more, it is a blunder if the worth can’t be losslessly changed over to a whole number. Assuming the DELETE statement additionally has an OFFSET clause it is correspondingly assessed and cast to a number worth. A negative LIMIT value is deciphered as “no restriction”.
On the off chance that the aftereffect of the assessing the LIMIT condition can’t be losslessly changed over to a number worth, it is a mistake. On the off chance that a DELETE statement has a LIMIT condition, the most extreme number of lines that will be erased is found by assessing the going with articulation and projecting it to a number worth. The RETURNING clause isn’t upheld for triggers. The LIMIT and ORDER BY clause (depicted underneath) are unsupported for DELETE proclamations inside triggers.
In the event that the table to which the trigger is connected is in the TEMP data set, at that point the unfit name of the table being erased is settled similarly all things considered for a high-level statement (via looking through first the TEMP data set, at that point the principle data set, at that point some other data sets in the request they were joined). In the event that the table to which the trigger is appended isn’t in the temp information base, at that point DELETE statement inside the trigger body should work on tables inside a similar data set as it. Prefix on the table name isn’t permitted inside triggers. The table-name indicated as a feature of a DELETE statement inside a trigger body should be inadequate. Restriction on DELETE statement when we use create trigger
Columns for which the articulation is bogus or NULL are held. Assuming a WHERE clause is provided, just those columns for which the WHERE clause Boolean articulation is genuine are erased. On the off chance that the WHERE clause is absent, all records in the table are erased. How Delete statement work in SQLite?īasically, the DELETE command eliminates records from the table recognized by the specified able-name. When we omit the WHERE clause, it deletes all rows from the table. In above syntax, we use delete statement to delete the specified records or we can say that rows from the specified, here specified table name means actual table name and specified search condition means actual condition with WHERE clause that we need to apply on the table for delete operation.
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