Table1 is Virtual Table with fts4 and TABLE2 is normal table.
Query1 (WORKS)
SELECT * FROM TABLE1 LEFT OUTER JOIN TABLE2 ON TABLE1.id=TABLE2.id WHERE TABLE1 MATCH 'sometext' LIMIT %d,%d
Query 2 (DOES NOT WORK)
SELECT * FROM TABLE2 LEFT OUTER JOIN TABLE1 ON TABLE1.id=TABLE2.id WHERE TABLE1 MATCH 'sometext' LIMIT %d,%d
Error from Query2
android.database.sqlite.SQLiteException: unable to use function MATCH
in the requested context (code 1)
From this it seems like FTS tabl need to be first on LEFT OUTER JOIN. Why this happening? Join happens first before applying WHERE clause. so if it was not working for table type mismatch i was assuming it would not work with query1 either. Anyone please explain this. what does happening internally? Also Any link to reference site would be appreciated explaining this.
MATCH works only on the FTS table itself, so it must be executed before the join.
In the second query, the database looks up matching rows first (with an outer join, it has no choice in the join order), and that temporary result is no longer an FTS table.
When using FTS, it usually is a better idea to move the FTS search (or the other search) into a subquery:
SELECT *
FROM Table2 LEFT JOIN (SELECT *
FROM Table1
WHERE Table1 MATCH ...)
USING (id);
Related
I Have Two Tables , Table1 Contains 10 Users Regular Data, Table2 Contains 3 vip users username(same as table1) only . Now how can I Get All 7 Non-VIP Users data using sql? Platform IS sqlite Database Android
Somnath,
It would be great if you would provide the database platform and actual table schemas in your question. Not having this information requires people to make assumptions. Anyway, I think it would like like this.
select *
from table1
where not exists(select * from table2 where table2.username = table1.username)
Something like:
SELECT * from Table1
WHERE user_id
NOT IN (SELECT user_id from Table2);
Translating to: Select everything in Table 1 where user_id doesn't exist in list of user_id's from Table2.
I have ids in my table, ids start from 1 to 20, I want a query, to find the first and last records in a given table but I want the result by some condition.
For example: if I have the record
1,2,3,4,5,9,10,11,12,13, 19,20
I need a result like 1-5, 9-13, 19-20 like this I need results
This is the island part of the classic gaps and islands problem (With the gaps part being finding the missing values in between each island). If you search for that term, you'll find a ton of material about how to calculate them.
One approach (Requires Sqlite 3.25 or newer for window function support):
sqlite> CREATE TABLE ex(id INTEGER PRIMARY KEY);
sqlite> INSERT INTO ex VALUES (1),(2),(3),(4),(5),(9),(10),(11),(12),(13),(19),(20);
sqlite> WITH cte AS (SELECT id, id - row_number() OVER (ORDER BY id) AS grp FROM ex)
...> SELECT min(id) AS rangestart, max(id) AS rangeend FROM cte GROUP BY grp;
rangestart rangeend
---------- ----------
1 5
9 13
19 20
SQL Query to find first record in your table:
SELECT * FROM <table_name> ORDER BY <column_name> ASC LIMIT 1
SQL Query to find last record in your table:
SELECT * FROM <table_name> ORDER BY <column_name> DESC LIMIT 1
For example: if I have the record 1,2,3,4,5,9,10,11,12,13, 19,20
I need a result like 1-5, 9-13, 19-20 like this I need results
If you need result like you have mentioned, then you can set LIMIT in your query to get how many records you can have in that query.
QUERY:
SELECT * FROM <table_name> LIMIT <any_number>
i have two table
and table two data is
and i want to show just like this
I have to make a table out of two other tables one table with column word and serial and another with column meaning
and serial.
Now what I have to do is put this result(data)
into table3 (a table i already have, with the same columns as in table1 and (table2) tried lots but can't please help me
I hope this isn't too confusing of a question.
select
a.serial,
b.word,
a.word as meaning
from tbl1 a
join tbl2 b on a.serial = b.serial
This is the sql query your looking for ,details related to the same is been provided in the link below
INSERT INTO table3 (serial,word,meaning)
SELECT t1.serial,t2.word,t1.word
FROM table1 as t1
JOIN table2 as t2 ON t1.serial=t2.serial
click here w3schools SQL tutorial
Try
select * from eng join other on eng.serial=other.serial
So I have three tables, each with different columns and one superclass table. I have a unique id for each entity that's in the superclass table and its own table.
I want to union the three tables and then join the result with the superclass table based on the id.
How do I go about this? I only have the unique id and no other information.
Edit:
I tried what you suggested but got this exception:
08-01 18:49:05.365: E/AndroidRuntime(10737): Caused by:
android.database.sqlite.SQLiteException: SELECTs to the left and right of UNION do not
have the same number of result columns: , while compiling: SELECT * FROM ((SELECT * FROM
pois UNION SELECT * FROM routes UNION SELECT * FROM events) t INNER JOIN features ON (pid
= t.features_pid)) WHERE pid = "poi2114"
Nested queries can serve as tables in the FROM clause.
select * from (
select ID from TableA
union
select ID from TableB) ab inner join TableX x on ab.ID = x.FooID
The field names in the constructed table ab follow the names in the first select that constitutes ab. So if the field in TableB is called something else, it will still be under the ID column. That's how UNION queries work.
Also, be mindful of the UNION ALL/UNION DISTINCT distinction.
Suppose I have two database files a.sqlite and other one is b.sqlite. suppose table1 is in a.sqlite and table2 in b.sqlite. I open a.sqlite in read-only mode and b.sqlite in read-write.Suppose both table table1 and table2 has same column name "description".table2 has description column with all null values and table1 has some values.So how can i add the data from table1 into table2.I know through query.But as these r in two different databse,so is there ant problem? Can any one suggest ?
Not sure if your environment allows it, but ATTACH DATABASE is normally the way to go:
http://www.sqlite.org/lang_attach.html