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#Sqlite count update
How to Update Gradle in Android Studio?.Android Projects - From Basic to Advanced Level.How to Change the Background Color of Button in Android using ColorStateList?.MVVM (Model View ViewModel) Architecture Pattern in Android.ISRO CS Syllabus for Scientist/Engineer Exam.ISRO CS Original Papers and Official Keys.GATE CS Original Papers and Official Keys.Then, we have passed a subquery to the EXISTS clause that selects the entire record from table “salesman,” where the ID from the table is equal to the MOBILE_ID from the table mobile. Now, we have a DELETE statement to which we have specified with the WHERE clause with the EXISTS keyword. You can see the record rows in the given table. We inserted two records in the salesman table by using the following query. Although we can’t use the SQLite FROM clause to list more than a table when eliminating, we use the SQLite EXISTS keyword instead.įor this, we have created a new table as “salesman” as follows: When we want to delete data in one table depending on the values in another. Now, by running the above query that non-Approved values containing rows have been successfully deleted from the table as follows:Įxample 4: Using SQLite DELETE With the EXISTS Condition There you can see that we have a field STATUS having non-Approved values. If you noticed from the above table where we have created the table and show the inserted records. We have used a DELETE term at first to delete the table name “mobile” and then applied the condition in the WHERE clause that deletes the record where MOBILE_ID is equal to “3”. In this example, we have a basic SQLite DELETE query with only one criterion in the WHERE clause. Sqlite > INSERT INTO mobile VALUES ( 6, 'Lenovo P2', 36900, '9023312', 'non-Approved' ) Īs from SQLite select query, we can see the new entry in the table “mobile.”The following record we have inserted above is shown in the table.Įxample 1: Using SQLite DELETE With the Condition Sqlite > INSERT INTO mobile VALUES ( 5, 'Infinix Zero X', 49999, '4091172', 'Approved' ) Sqlite > INSERT INTO mobile VALUES ( 3, 'Tecno Spark', 24999, '9012675', 'Approved' ) Inside the table “mobile,” the column names are set as MOBILE_NAME, MOBILE_PRICE, MOBILE_CODE, and STATUS with the different data types. Then, we can use the SQLite delete statement to delete the records from the rows, and we can also delete the table. Columns with a false or NULL expression are retained.įirst, we have created the following table as “mobile” in SQLite.
Only the entries over which the WHERE clause’s Boolean is valid are eliminated when a WHERE clause is given. All data from the table is erased if the WHERE condition is not found. The DELETE command, in essence, removes data from the table identified by the provided table name. When the WHERE clause is removed, the entire table is deleted. Here, the supplied table name refers to the actual table that exists in the database, and the specified search condition refers to the actual WHERE clause condition that we must apply to the table to delete it. We used a delete statement and specified some attributes to delete values from the table, as you can see in the SQLite Delete statement above.
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