Even if it does not seem hard I'm having trouble coming up with a rawQuery in Android that delete duplicate entries based on the second id
CREATE TABLE `sms` ( `_id` INTEGER, `thread_id` INTEGER, `address` TEXT, `person` INTEGER, `date` INTEGER, `protocol` INTEGER
If you’re working with an
2 Answers Sorted by: 5 Supposing you have no foreign keys referencing that table, you could do something like create table some_table as select min (id), name, age
In case, since rows 1 and 2
Duplicate rows refer to entries within a database table that share identical values across all columns or a subset of
I have inserted some values in the table DataTab
To prepare for the graded coding quiz, you will be asked to execute a query, read the results, and select the correct answer you
id );
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Note that we could have used the DogId column (our primary key)
SQLite DISTINCT keyword is used in conjunction with SELECT statement to eliminate all the duplicate records and fetching only the unique records
If the simple SELECT is a SELECT ALL, then the entire set of result rows are returned by the SELECT
SELECT * FROM AQ_ADRESSES LEFT OUTER JOIN AQ_CP_ADRESSES using (IdAdr) LEFT OUTER JOIN AQ_ODONYMES using (Seqodo) LEFT OUTER JOIN
One of the ALL or DISTINCT keywords may follow the SELECT keyword in a simple SELECT statement
SomeId: Integer => Autogenerated primary key
1 Answer
SELECT name, milliseconds, bytes, albumid FROM tracks WHERE albumid = 1; Code language: SQL (Structured Query Language) (sql)
(You'd have to
One of the ALL or DISTINCT keywords may follow the SELECT keyword in a simple SELECT statement
This works: DELETE FROM tablename WHERE ID NOT IN ( SELECT T
Average ); This query finds the rows with the highest average per person (based on ID1), then deletes all
SELECT MAX (recid), firstname, lastname FROM table2 T2 WHERE EXISTS (SELECT * FROM table1 WHERE firstname = T2
As a relational database, SQLite allows you to query data using SQL syntax
This SQL statement deletes all records that are duplicates except for the one with the smallest (SQLite’s automatic row identifier), thus 6
Group the results by Email, then take the first or last corresponding record: SELECT Email , MIN (AccountName) AS Account FROM table GROUP BY Email; UPDATE : Note that you can add a unique constraint to the email column, so that SQLite errors out if you try to insert the same value a second time: