delete N.* from Tbl_Nodes N, Data_Tree DT WHERE N.Part = DT.Part
for this command I am getting following error.
System.Data.SQLite.SQLiteException: SQLite error near "N": syntax error
Above command works fine for MSAccess.
Is there any alternative to use table shortcut in Sqlite?
The DELETE statement operates on a single table and does not use a table alias. Therefore, your FROM clause must read FROM Tbl_Nodes.
You're probably looking for:
delete from Tbl_Nodes WHERE Part IN (SELECT Part FROM Data_Tree)
Note that this will remove all nodes from Tbl_Nodes that have a corresponding Part value in Data_Tree but does not remove any records from Data_Tree itself.
While SQL varies somewhat among vendors, as a general principle it's a mistake to learn SQL from MS Access and try to apply it to other products. MS Access features some very non-standard constructions.
Using an alias for the table?
FROM table AS t1
You're missing a bit of your SQL statement there I guess but does it not work if you just say:
delete N from Tbl_Nodes N, Data_tree DT WHERE...(rest of statement)
I've just removed the .*
Related
I am attempting to drop an entire table in RIAK TS, but nothing seems to work. I have tried both "drop table" in a standard query so (using Python):
from riak import RiakClient
client = RiakClient(host = '127.0.0.1')
client.ts_query('ticks', 'DROP TABLE ticks')
but this gives me an error that DROP is not understood. An alternative would be to delete everything in the table using client.ts_delete('ticks', ["rows"]) but this seems to need me to specify the row keys. Is there a wildcard option for row keys, and if not, how do I get all row keys given the subquery size limits?
As of Riak TS 1.4.0 DROP TABLE is not supported and there is no other means to delete tables.
Range deletes (or deleting more than one row) is also not yet supported however you can batch delete statements.
ALTER, DROP, and range deletes are all features on the Riak TS road map for future releases.
I am new to robotframework and I am trying to get the hang of the keywords of DatabaseLibrary. I am getting error at 3 of such keywords.
1) I am using rowcount keywords as below-
${rowCount} Row Count <sql query>
And I always get ${rowCount}=0 irrespective of the number of rows in my table.
2) I am using Delete All Rows From Table as below-
Delete All Rows From Table <Table_Name>
And I get ORA-00911: invalid character but if use the same table with other keywords like Query ,it works fine.
3) I am using Table Must Exist as below-
Table Must Exist <Table_Name>
And I get ORA-00942: table or view does not exist but this table is very much there.
Please help me find what am I doing wrong.
Thanks in Advance!!!
I could be wrong but I believe a colleague told me there were issues, at the very least with the Row Count keyword.
However, for all three options there are easy solutions, which you've even hinted at in your question by using Query or Execute SQL Script
1)
${result}= Query Select count(id) from table
${rc} = ${result[0][0]} #Play with this as I forget exact syntax
2) Put your delete script in a test scripts folder with your tests and call it using Execute SQL script. You could also use Query to perform a select query before and after to confirm expected states.
3) Again perform a query against the table you're expecting to be there, a simple row count on id would do for this purpose. You could set a variable based on the result and use this again later if required.
I had similar issues.
I use cx_Oracle.
With the Table Must Exist keyword my problem was the same.
I dont really understand why, but first I have to use Encode String to Bytes keyword.
And I need to use a DatabaseLibrary 0.8 at least, because earlier versions didnt have solution for cx_Oracle. These solved this issue for me.
But with Delete all rows from table I still have problems.
Because this keyword puts a ; at the end of the line and it passes on that line to execute query if I understand weel, so it still causes an ORA-00911 error for me.
With Execute Sql String and the command DELETE FROM tablename you can have the same results, but it will work this way.
I hope it helps a little
I'm using RJDBC to connect to a local database. This allows me to make SELECT queries easily using dbGetQuery, and CREATE TABLE using dbWriteTable.
However, I cannot figure out a method to DROP TABLE or DELETE or SELECT INTO directly from my R console. These things work when I do it directly in SQL Developer, but not when I pass the query onto the database from R.
How do I perform database record manipulations which are not SELECT statements using R?
I'd try using a different type instead.
dbGetQuery bases itself on finding and iterating over the DB rather than manipulating it's records.
Similar questions were asked before;
I couldn't find a nice R example, but if it helps, A nice java example could be found here:
EDIT:
I found the type I was talking about! Took me a while, anyhow - sqlQuery allows you to run pretty much any query, that is - a change in the DB records. Example I modified from this source:
res <- sqlQuery(con1,"DELETE TABLE TESTDATA", errors=FALSE)
# res will now hold the result of the query.
# -1 means error, otherwise iteration is sucessful, and it will hold the number of rows affected.
if (res == -1){ #if something messed up
cat ("An error has occurred.\n")
msg <- odbcGetErrMsg(con1) #Use your connection for this.
print (msg)
} else {
cat ("Table was deleted successfully.\n")
}
EDIT 2:
I got it confused with RODBC, however there's no reason to worry, since I found the RJDBC alternative as well! It's called, dbSendUpdate. Example:
# Assuming you have the connection saved as conn; these example shows how to use dbSendUpdate to create tables and insert values.
# You could use it with every non-selective query, that is, which manipulates the record (update,delete,insert,drop etc.)
# create table, with dbSendUpdate:
dbSendUpdate(conn, "CREATE TABLE foo(a INT,b VARCHAR(100))")
# insert value, bind parameters to placeholders in statement:
dbSendUpdate(conn, "INSERT INTO foo VALUES(?,?)", 42, "bar")
# feel free to modify the query itself, these are just example values.
this is similar to another answered question here
basically dbGetQuery() as it name implies is used to send queries and recive their result.
if you want to send a general statement to the db like 'drop table' etc.
you can use:
dbSendUpdate(connection_object, "drop table table_name")
I am using SQLite for my application. when I used truncate command in SQLite it gives me error like " syntax Error near truncate".
Can anyone help me to solve this problem or any other alternative of truncate except DELETE command.
Why not DELETE?
DELETE with an empty WHERE clause should be pretty fast in SQLite because it does sth called "truncate optimization", see
http://www.sqlite.org/lang_delete.html
SQLite DELETE FROM is not equivalent to T-SQL TRUNCATE TABLE.
SQLite DELETE FROM will not reset the index in a field marked autoincrement.
The SQLLite Delete Truncation Optimization DELETE FROM {table}; (with no WHERE clause) has similar behaviour to the SQL Server TRUNCATE TABLE {table};. See the SQLLite documentation here
The Truncate Optimization
When the WHERE is omitted from a DELETE statement and the table being deleted has no triggers, SQLite uses an optimization to erase the entire table content without having to visit each row of the table individually. This "truncate" optimization makes the delete run much faster. Prior to SQLite version 3.6.5 (2008-11-12), the truncate optimization also meant that the sqlite3_changes() and sqlite3_total_changes() interfaces and the count_changes pragma will not actually return the number of deleted rows. That problem has been fixed as of version 3.6.5 (2008-11-12).
The truncate optimization can be permanently disabled for all queries by recompiling SQLite with the SQLITE_OMIT_TRUNCATE_OPTIMIZATION compile-time switch.
There is none.
Just use DELETE without any arguments.
This is how it is implemented by Drupal 7's database abstraction layer:
http://api.drupal.org/api/drupal/includes--database--sqlite--query.inc/function/TruncateQuery_sqlite%3A%3A__toString/7
I get the following error:
Cannot use empty object or column names. Use a single space if necessary.
Msg 1038, Level 15, State 3, Line 1
and the query command looks like:
SELECT TOP 100 PERCENT
[].[cms_page].[pa_id], [].[cms_page].[pa_key],
[].[cms_page].[pa_title], [].[cms_page].[pa_keywords],
[].[cms_page].[pa_description], [].[cms_page].[pa_header],
[].[cms_page].[pa_created], [].[cms_page].[pa_modified],
[].[cms_page].[pa_language] FROM [cms_page]
WHERE
[cms_page].[pa_key] = #pa_key0
ORDER BY
[pa_id] ASC;
Strange indeed. Why does this happen? I'm using SubSonic 2.1.
Connectionstring:
<add name="OCDB" connectionString="Network Library=DBMSSOCN;Data Source=127.0.0.1,1433;Initial Catalog=test_db;User ID=test;Password=testpwd"/>
Edit: Well the solution was just to simply generate and rebuild the Data Access Layer and I was good to go.
You seem to be using a 3 part name with part of it empty, i.e. '[].'
It looks as though the query text is being constructed with an empty table schema.
Those empty [] square brackets should contain something like "dbo" to make the query syntactically valid. I don't know enough about SubSonic to give you a code sample though.
I'm not familiar with SubSonic, but have you tried a simpler query to test if you have your syntax correct? Does this query even work in SQL Server (Management Studio / Query Analyzer)?
Just looking at this from the perspective of SQL Server, you are using way too many brackets. If I was writing that query in SQL Server, it would look more like what I wrote below. I'm not sure about the variable #pa_key0, is this query part of a stored procedure or does SunSonic replace this variable when the query is ran?
SELECT
pa_id,
pa_key,
pa_title,
pa_keywords,
pa_description,
pa_header,
pa_created,
pa_modified,
pa_language
FROM
cms_page
WHERE
pa_key = #pa_key0
ORDER BY
pa_id ASC;
I think you need to set the schema for Subsonic to use. This thread seems to have some information:
Subsonic - How to use SQL Schema / Owner name as part of the namespace?