|SQLite subquery: "IN" the result of the outer query|
The GROUP BY name operation can be sped up if the
database is able to go through the rows in order,
without having to sort the table.
This can be done with an index on the name column
(the other column makes this a covering index,
which helps only a little more):
CREATE INDEX user_name_id_index ON user(name, id);
The query looks up pair rows by their id, a, and b
values; these lookups can be sp
|Sqlite select * from multiple tables|
Use UNION or UNION ALL. The first removes
duplicates from the result set, the second one
SELECT * FROM table1
SELECT * FROM table2
|Corona SQLIte : Checking if a value exists or not|
Syntax error is a result of misunderstanding of
your query by the SQL.
One of the most often reasons is incorrect string
insertion. So I suppose that row_xx.code is a
To solve the problem you should "quote"
row_xx.code by ' symbol like this:
CheckInventory = "SELECT * FROM inventory WHERE
To solve the second part of the problem and figure
out if value e
|Connecting to sqlite file using Vaadin|
When troubleshooting some connection issue buried
in layers of abstraction, try to get right to the
simplest possible version of what you are doing.
First, connect to the database without Vaadin to
verify that the db server is running and the
connection code is wrong.
If that works fine, then the configuration problem
is on the Vaadin side. Try connecting without the
special sql container. Just
|Using COLLATE on peewee queries|
You can specify a collation by building up the SQL
clause and passing it to order_by().
collated = Clause(MyModel.field, SQL('COLLATE
For the index unfortunately you will need to
create that by hand as peewee does not know how to
add collation information to the CREATE INDEX SQL.
If you'd like to open a pull-reques
|Android - Storing a Camera image file path into SQLite db.|
Please check if it helps:
Write a method which will return all rows from the
images table into a cursor.
Create a Cursor adapter and bind it to the list
Use ImageView.setImageURI() to bind image URI with