Should I expect to be able to see tempdb tables in SSMS?
e.g. If I run this code, should I expect to be able to see the table in SSMS?
-- Drop the table if it already exists
IF (SELECT OBJECT_ID('tempdb..#TempPasswords')) IS NOT NULL
DROP TABLE #TempPasswords
CREATE TABLE #TempPasswords (
MemberNo INT,
Password nvarchar(120),
NewPassword varbinary(MAX)
)
Only if you run your code snippet in SSMS. In that session you will be able to execute
T-SQL that include your temp table.
In order to see temp tables globally use two hashes ##.
It is possible to see the temp DB but the name only. To see temp DB follow the instruction as per the image. After running the query right click on the Temporary Tables and Refresh .
Related
I have a database called mbt. I wanted to write some data from temporary table to real table.
--I used this query.
SELECT * INTO new_table FROM #tmp
when i runned the query it returned normal message.
15813 row(s) affected
After that i checked my tables in mbt database, but i couldn't see 'new_table'
how could such a thing be, where the table might have gone.
I may have forgotten to use 'use MBT' statment at the beginning of the query. Does it make problem
I'm using ms sql server 2014(SP2)(KB3171021)-12.0.5000.0(X64)
ANSWER
It gone to Master DB
select 'master' as DatabaseName,
T.name collate database_default as TableName
from master.sys.tables as T
It Will create a new table on your database. but you did not use so it will store in master database on your server.
Run the query below to find databases which have the object new_table:
sp_MSForEachDB 'Use [?] IF EXISTS (SELECT 1 FROM sys.objects WHERE name= ''new_table'')
SELECT DB_NAME()'
I had the same problem. What i did is, I rewrite the statement of use Database and then refresh the database browser after that i got Result. You can try it. may be it will help you.
Always use command "USE db_name" to make sure that you are querying right database.
Below command will show all databases available on the server.
SHOW DATABASES;
If you are using GUI tool to connect DB server, there is a possibility that at the time of connection you got connected to different DB. If you executed the query to create table and inserted record. These records are inserted in new table in different DB than mbt.
I have three SQL queries results saved in batch in three temporary tables in a SQL Server database but these temp table seems to be not available in tableau while connecting to the database from tableau.
For example:
Create a temp table #p
CREATE TABLE #p
(
PersonID int,
LastName varchar(255),
FirstName varchar(255),
Address varchar(255),
City varchar(255)
);
Insert values into #p from main table
insert into #p
select *
from Persons
where PersonID in (1, 2, 3);
After connecting to the SQL Server data source in tableau the #p temp table is not showing up in the table list. Is there any possible way I can use the temp table in tableau for dashboard? If not kindly suggest some alternatives on how to make these temp table available in dashboard.
I am struggling to solve this issue for past few days so hope to hear some suggestions from you guys soon..thank you!
Local temporary tables are session-scoped (it means they are only visible in the very same session where they have been generated).
You can try with Global Temporary Tables (SQL Server uses ## in front of their names) or normal tables if you want them to be visible in other sessions...
Both Local and Global Temporary tables will disappear when the session where they have been generated is closed.
Temporary tables(including global temporary tables) will be deleted automatically when no more connections are accessing them. Being said that, there are a couple of ways to achieve what you are trying to do in Tableau.
1. Initial SQL with Temp Table
Tableau has an 'Intial SQL' option that you can select when defining the connection. These statements will be executed every time Tableau make a connection to the server. please note that temporary tables are created in tempdb; so you have to change the database to tempdb. You also have to use fully qualified table name in your SQL. Please pay special attention to the highlighted areas.
2. Stored Procedure
If you have enough access rights, you can create your query as a stored procedure and call it from Tableau. Stored Procedures will be displayed as a separate section under your tables.
This is probably a multipart question:
When I issue the statment
IF OBJECT_ID('temp..#tablename) IS NOT NULL --drop the table here
it does not drop the temp table. When I go look at the temp db, the name is something totally different...
#tablename___________________________________________00000001069F
Obviously, the drop statement wont work with this. How can I make sure that the temp table gets dropped with the above statement.
Also, if I use the "USE dbName" before the create temp table statement, does the temp table still get created in tempdb or the the dbName database? Is the default always tempDb?
Thanks,
RV.
use should use
OBJECT_ID('tempDB..#tablename')
not
OBJECT_ID('temp..#tablename')
does the temp table still get created in tempdb or the the dbName database? Is the default always tempDb?
YES
Temp Tables always gets created in TEMPDB..
Reason why you are seeing name like _____00000001069F is due to the fact that Temp tables are session specific and SQL takes care of assigning names to them,so that names won't conflict,even when they are used in parallel sessions with same names
Look out this answer on DBA.SE for more info,specifically look out Temp Tables section :
What's the difference between a temp table and table variable in SQL Server?
I have a migration script with the following statement:
ALTER TABLE [Tasks] ALTER COLUMN [SortOrder] int NOT NULL
What will happen if I run that twice? Will it change anything the second time? MS SQL Management Studio just reports "Command(s) completed successfully", but with no details on whether they actually did anything.
If it's not already idempotent, how do I make it so?
I would say that second time, SQL Server checks metadata and do nothing because nothing has changed.
But if you don't like possibility of multiple execution you can add simple condition to your script:
CREATE TABLE Tasks(SortOrder VARCHAR(100));
IF NOT EXISTS (SELECT 1
FROM INFORMATION_SCHEMA.COLUMNS
WHERE [TABLE_NAME] = 'Tasks'
AND [COLUMN_NAME] = 'SortOrder'
AND IS_NULLABLE = 'NO'
AND DATA_TYPE = 'INT')
BEGIN
ALTER TABLE [Tasks] ALTER COLUMN [SortOrder] INT NOT NULL
END
SqlFiddleDemo
When you execute it the second time, the query gets executed but since the table is already altered, there is no effect. So it makes no effect on the table.
No change is there when the script executes twice.
Here is a good MSDN read about: Inside ALTER TABLE
Let's look at what SQL Server does internally when performing an ALTER
TABLE command. SQL Server can carry out an ALTER TABLE command in any
of three ways:
SQL Server might need to change only metadata.
SQL Server might need to examine all the existing data to make sure
it's compatible with the change but then change only metadata.
SQL Server might need to physically change every row.
I have an application that uses a SQL Server database with several instances of the database...test, prod, etc... I am making some application changes and one of the changes involves changing a column from a nvarchar(max) to a nvarchar(200) so that I can add a unique constraint on it. SQL Server tells me that this requires dropping the table and recreating it.
I want to put together a script that will do the table drop, recreate it with the new schema, and then reinsert the data that was there previously all in one go, if possible, just to keep things simple for use when I migrate this change to production.
There is probably a good SQL Server way to do this but I'm just not aware of it. If I was using Mysql I would mysqldump the table and its contents, and use that as my script for applying that change to production. I can't find any export functionality in SQL server that will give me a text file consisting of inserts for all data in a table.
Use SQL Server's Generate Scripts command
right click on the database; Tasks -> Generate Scripts
select your tables, click Next
click the Advanced button
find Types of data to script - choose Schema and Data.
you can then choose to save to file, or put in new query window.
results in INSERT statements for all table data selected in bullet 2.
No need to script
here are two ways
1 use alter table ....alter column.....
example..you have to do 1 column at a time
create table Test(SomeColumn nvarchar(max))
go
alter table Test alter column SomeColumn nvarchar(200)
go
2 dump into a new table while converting the column
select <columns except for the columns you want to change>,
convert(nvarchar(200),YourColumn) as YourColumn
into SomeNewTable
from OldTable
drop old table
rename this table to the same table as the old table
EXEC sp_rename 'SomeNewTable', 'OldTable';
Now add your index