These only strip lines with Space characters. I need also to filter
out also tabs, carriage returns and all series characters that
constitute a white space.
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How do I filter out records that contain WHITE SPACE in a field or
have this field empty?
For example:
select * from mytable
where fld <> "" and fld LIKE .
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Hi Nishit,
> can anyone tell me the syntax of passing a C variable in a query.
> i have taken a variable as float hd= 2000.0;
> how it'll be passed in a query and what'll be the syntax of that query.
First use sprintf () to insert your variable into SQL code. Then
execute the resulting SQL
Is it possible to write a conditional SQL code like this? CASE
expression does not seem to work here
IF (exists (Select * from tab1))
THEN
Insert into tab2 select * from tab3
ELSE
Insert into tab2 select * from tab4
ENDIF;
Igor,
Your query works now and returns 4 records. that was my mistake
probably. Thank you!
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Igor,
That's not quite true. ORDER BY and LIMIT are allowed in sub-selects, as
is the case here. This query works, I tested it before posting.
Your query returns 2 records instead of 4. I'm testing it on SQLite v3.3.10
Igor,
select * from (select * from fruits where type = 'apple' order by price limit 2)
union all
select * from (select * from fruits where type = 'orange' order by price limit
2)
SQlite allows only one LIMIT clause per query, that is applied to the
final resultset
I need to select top 2 (or N) most expensive fruits of each type from
this table:
+++---+
| type | variety| price |
+++---+
| apple | gala | 2.79 |
| apple | fuji | 0.24 |
| apple | limbertwig | 2.87 |
| orange | valencia |
Update to version version 3.3.17 has solved the problem.
The issue existed in version 3.3.14
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When I execute the SQL code below on a newly created DB file I get an
error 'table Tab already exists', and it creates a table
-- comment
CREATE TABLE Tab(ID);
Code below works without error messages:
CREATE TABLE Tab(ID);
What is the best way to copy records between tables located in
different DB files?
Both DBs have completely the same structure. I need to add records
from table in DB1 to table in DB2. Logically something like this:
INSERT INTO .table1
SELECT *
FROM .table1
This issue has been resolved. I did not call sqlite3_finalize() in the
reader process and kept the READ lock
How to read after the database was written by another process?
Reading function should wait until other process finishes writing and
unlocks the file. But in our case unlocking never
happens after
writing is finished.
Only when you restart the reader process in can read again.
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Thanks,
Yuriy Martsynovskyy
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until you close and open the process 2 again.
How is such configuration supposed to work in SQLite when we need 1
writer process and 1 or more reader processes?
Working on Windows XP SP2
SQLite 3.3.8 with CppSqlite3 wrapper
--
Thanks,
Yuriy Mar
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