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I need to export values from an Sqlite table with 3 Columns to a CSV File.
Should write a loop and use the Select Query to Dump all Values or is there an inbuilt SQL Function to do this..
Im here
void writecsv()
{
char c[1000];
FILE *fptr;
fptr=fopen("output.csv","w");
}
Not built into the SQLite lib, but you could use the sqlite3 CLI with the commands .mode csv and .output. This is also scriptable by using an init file and reading the SQL commands from stdin/file.
I used the system call to do it
system("sqlite3 -header -csv 'db2.db' 'select * from tdata;' > out.csv");
Related
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I m trying to convert oracle to snowflake
HASH(NAME CONCAT '#'
CONCAT Address CONCAT '#'
CONCAT DECODE(phone,'true','Y','N') CONCAT '#'
CONCAT column_name, 123456) hash_key
Can anyone please help me here.
Try:
SELECT HASH(NAME || '#'
|| ADDRESS || '#'
|| DECODE(PHONE,'true','Y','N')
|| '#' || COLUMN_NAME
) AS HASH_KEY
Check the documentation for specifics on hash functions and variations on the concatenation function.
https://docs.snowflake.com/en/sql-reference/functions/hash.html
https://docs.snowflake.com/en/sql-reference/functions/concat.html
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I have tried these:
1.if (EXEC SQL EXIST SELECT ...)
2.EXEC SQL IF EXIST SELECT ...
but none of these work,any help?
Select the count and check whether it is zero. Something along this line:
int a;
EXEC SQL SELECT count(*) INTO :a
FROM some_table
WHERE some_condition;
if (a != 0)...
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Is it possible to use case statement inside stuff function with for xml path() ?
Yes you can use a 'CASEstatement insideSTUFFwhen usingFOR XML PATH`
SELECT STUFF('alpha',3,5,CASE WHEN 1=1 THEN 'a' ELSE 'b' END) FOR XML PATH('test')
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I have an XML string stored in SQL. The program that inserts the XML doesn't tag all the objects inside.
Example of string:
<XMLInfo Sample1="1234" Sample2="1234" Sample3="1234" Sample4="1234" />
I need to delete the sample2 item completely. Other things complicating this is that Sample2 may not be followed by sample3 every time and sample2 does not have a fixed length.
SQL Server:
update test set data.modify('delete XMLInfo/#Sample2');
sql fiddle demo
PostgreSQL (I think there's no xml parsing/modifying functions, but there extensions):
create or replace function remove_attrib(data xml, attr text)
returns xml
as
$$
import xml.etree.ElementTree as ET
r = ET.fromstring(data)
del r.attrib[attr]
return ET.tostring(r)
$$ language plpython3u;
update test set data = remove_attrib(data, 'Sample2');
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I have a question about SQL Server's IF clause.
For example - look at this code:
IF (#logpath IS NOT NULL || #ptd IS NOT NULL)
Can I use || in the condition when I use IF statement?
Is this correct?
|| is not valid Transact-SQL syntax. You need to user 'OR' or 'AND'
Example
IF #logpath is not null OR #ptd is not null
BEGIN
-- do something
END
You cannot use the || operator in SQL Server. Please refer the following link which shows the list of logical operators in SQL Server
http://msdn.microsoft.com/en-us/library/ms189773.aspx