SQL Server Insert if not exist

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I want to insert data in my table, but insert only that doesn't exist in my DB!

here is my code:

ALTER PROCEDURE [dbo].[EmailsRecebidosInsert]
  (@_DE nvarchar(50),
   @_ASSUNTO nvarchar(50),
   @_DATA nvarchar(30) )
AS
BEGIN
   INSERT INTO EmailsRecebidos (De, Assunto, Data)
   VALUES (@_DE, @_ASSUNTO, @_DATA)
   WHERE NOT EXISTS ( SELECT * FROM EmailsRecebidos 
                   WHERE De = @_DE
                   AND Assunto = @_ASSUNTO
                   AND Data = @_DATA);
END

And the error is:

Msg 156, Level 15, State 1, Procedure EmailsRecebidosInsert, Line 11 Incorrect syntax near the keyword 'WHERE'.

instead of below Code

BEGIN
   INSERT INTO EmailsRecebidos (De, Assunto, Data)
   VALUES (@_DE, @_ASSUNTO, @_DATA)
   WHERE NOT EXISTS ( SELECT * FROM EmailsRecebidos 
                   WHERE De = @_DE
                   AND Assunto = @_ASSUNTO
                   AND Data = @_DATA);
END

replace with

BEGIN
   IF NOT EXISTS (SELECT * FROM EmailsRecebidos 
                   WHERE De = @_DE
                   AND Assunto = @_ASSUNTO
                   AND Data = @_DATA)
   BEGIN
       INSERT INTO EmailsRecebidos (De, Assunto, Data)
       VALUES (@_DE, @_ASSUNTO, @_DATA)
   END
END

Updated : (thanks to @Marc Durdin for pointing)

Note that under high load, this will still sometimes fail, because a second connection can pass the IF NOT EXISTS test before the first connection executes the INSERT, i.e. a race condition. See stackoverflow.com/a/3791506/1836776 for a good answer on why even wrapping in a transaction doesn't solve this.

SQL: Fastest way to insert new records where one doesn't already , To ensure SQL Server didn't keep any queries (or anything for that matter) Leave a comment and share the knowledge if you have any suggestions or INSERT INTO @Results VALUES ('Insert Where Not Exists', @max,  In Microsoft SQL Server, I can use an IF statement: if not exists (select * from url where url = ) insert into url This has to be wrapped in a transaction to avoid a race condition, though.

For those looking for the fastest way, I recently came across these benchmarks where apparently using "INSERT SELECT... EXCEPT SELECT..." turned out to be the fastest for 50 million records or more.

Here's some sample code from the article (the 3rd block of code was the fastest):

INSERT INTO #table1 (Id, guidd, TimeAdded, ExtraData)
SELECT Id, guidd, TimeAdded, ExtraData
FROM #table2
WHERE NOT EXISTS (Select Id, guidd From #table1 WHERE #table1.id = #table2.id)
-----------------------------------
MERGE #table1 as [Target]
USING  (select Id, guidd, TimeAdded, ExtraData from #table2) as [Source]
(id, guidd, TimeAdded, ExtraData)
    on [Target].id =[Source].id
WHEN NOT MATCHED THEN
    INSERT (id, guidd, TimeAdded, ExtraData)
    VALUES ([Source].id, [Source].guidd, [Source].TimeAdded, [Source].ExtraData);
------------------------------
INSERT INTO #table1 (id, guidd, TimeAdded, ExtraData)
SELECT id, guidd, TimeAdded, ExtraData from #table2
EXCEPT
SELECT id, guidd, TimeAdded, ExtraData from #table1
------------------------------
INSERT INTO #table1 (id, guidd, TimeAdded, ExtraData)
SELECT #table2.id, #table2.guidd, #table2.TimeAdded, #table2.ExtraData
FROM #table2
LEFT JOIN #table1 on #table1.id = #table2.id
WHERE #table1.id is null

how to insert new record in my table if not exists?sql server 2005 , I want to insert a new record into my table if does not exist. When I write this code for example: Hide Copy Code. insert into tablename (code)  It's not as if the SQL Server evaluates the subquery first and then at some later point, and without holding a lock, goes on to do the insert. – Ed Avis Aug 17 '17 at 11:40 |

i would use a merge:

create PROCEDURE [dbo].[EmailsRecebidosInsert]
  (@_DE nvarchar(50),
   @_ASSUNTO nvarchar(50),
   @_DATA nvarchar(30) )
AS
BEGIN
   with data as (select @_DE as de, @_ASSUNTO as assunto, @_DATA as data)
   merge EmailsRecebidos t
   using data s
      on s.de = t.de
     and s.assunte = t.assunto
     and s.data = t.data
    when not matched by target
    then insert (de, assunto, data) values (s.de, s.assunto, s.data);
END

How to Write INSERT if NOT EXISTS Queries in Standard SQL, There's no syntax like this: insert if not exists into url(url) values() In Microsoft SQL Server, I can use an IF statement: if not exists (select * from  If clockDate is NOT datetime field (just date), then the SQL engine will do it for you - no need to cast on a set/insert statement. IF (NOT EXISTS(SELECT * FROM Clock WHERE clockDate = '08/10/2012') AND userName = 'test') BEGIN INSERT INTO Clock(clockDate, userName, breakOut) VALUES(GetDate(), 'test', GetDate()) END ELSE BEGIN UPDATE Clock SET breakOut = GetDate() WHERE clockDate = '08/10/2012' AND userName = 'test' END

Try below code

ALTER PROCEDURE [dbo].[EmailsRecebidosInsert]
  (@_DE nvarchar(50),
   @_ASSUNTO nvarchar(50),
   @_DATA nvarchar(30) )
AS
BEGIN
   INSERT INTO EmailsRecebidos (De, Assunto, Data)
   select @_DE, @_ASSUNTO, @_DATA
   EXCEPT
   SELECT De, Assunto, Data from EmailsRecebidos
END

SQL Server Insert if not exist, Instead of using the second part of your code i.e.. BEGIN. INSERT INTO EmailsRecebidos (De, Assunto, Data). VALUES (@_DE, @_ASSUNTO  I just want to show that IF NOT EXISTS() INSERT method isn't safe. You have to execute first Session #1 and then Session #2. After v #2 you will see that without an UNIQUE index you could get duplicate pairs (SoftwareName,SoftwareSystemType). Delay from session #1 is used to give you enough time to execute the second script (session #2).

The INSERT command doesn't have a WHERE clause - you'll have to write it like this:

ALTER PROCEDURE [dbo].[EmailsRecebidosInsert]
  (@_DE nvarchar(50),
   @_ASSUNTO nvarchar(50),
   @_DATA nvarchar(30) )
AS
BEGIN
   IF NOT EXISTS (SELECT * FROM EmailsRecebidos 
                   WHERE De = @_DE
                   AND Assunto = @_ASSUNTO
                   AND Data = @_DATA)
   BEGIN
       INSERT INTO EmailsRecebidos (De, Assunto, Data)
       VALUES (@_DE, @_ASSUNTO, @_DATA)
   END
END

How to INSERT If Row Does Not Exist (UPSERT) in MySQL, Learn how to INSERT an If Row Does Not Exist (UPSERT) in MySQL. to INSERT rows after determining whether that row is, in fact, new or already exists. After launching and connecting to SQL Server Management Studio, create a new  INSERT INTO TheTable SELECT @primaryKey, @value1, @value2 WHERE NOT EXISTS (SELECT 0 FROM TheTable WITH (UPDLOCK, HOLDLOCK) WHERE PrimaryKey = @primaryKey) Also, if you actually want to update a row if it exists and insert if it doesn't, you might find this question useful.

How is IF NOT EXISTS SELECT THEN INSERT faster than UNIQUE , FINAL UPDATE: It's the INSERT that's really slowing things down. When a Unique index is in place, with every new record you add SQL has to  Insert Where Not Exists; MERGE; Insert Except; LEFT JOIN . Setting Things Up for the Speed Test. For testing purposes, the SQL code was executed on a Windows 2012 Server with 128GB memory, 16 core CPU, using Microsoft SQL Server 2014. To ensure SQL Server didn’t keep any queries (or anything for that matter) cached, the following code was run before each test:

How to insert or update using single query?, IF EXISTS(select * from test where id=30122) update test set name='john' where id=3012 ELSE insert into test(name) values('john'); Assuming SQL Server 2008 or later, you could use MERGE : Table. CREATE TABLE dbo.Test ( id integer NOT NULL, name varchar(30) NULL, CONSTRAINT PK_dbo_Test__id PRIMARY  'if not exists()' is working just fine. It's your use of it that may be questionable. You may want to title your question something like 'How do I use SQL Server IF NOT EXISTS?' instead. – yfeldblum Jul 24 '09 at 1:06

https://social.msdn.microsoft.com/Forums/sqlserver, Learn how to INSERT an If Row Does Not Exist (UPSERT) in MySQL. MySQL provides a number of useful statements when it is necessary to INSERT rows after determ…

Comments
  • You should not rely on this check alone to ensure no duplicates, it is not thread safe and you will get duplicates when a race condition is met. If you really need unique data add a unique constraint to the table, and then catch the unique constraint violation error. See this answer
  • You can use MERGE query or If not exist( select statement ) begin insert values END
  • It depends on the scenario if you should relay or not on this check. If you are developing a deploy script that writes data to a "static" table for example, this is not an issue.
  • you can use "if not exists (select * from..." like this stackoverflow.com/a/43763687/2736742
  • @GarethD: what do you mean "not thread safe"? It may not be elegant but it looks correct to me. A single insert statement is always a single transaction. It's not as if the SQL Server evaluates the subquery first and then at some later point, and without holding a lock, goes on to do the insert.
  • Note that under high load, this will still sometimes fail, because a second connection can pass the IF NOT EXISTS test before the first connection executes the INSERT, i.e. a race condition. See See stackoverflow.com/a/3791506/1836776 for a good answer on why even wrapping in a transaction doesn't solve this.
  • SELECT 1 FROM EmailsRecebidos WHERE De = @_DE AND Assunto = @_ASSUNTO AND Data = @_DATA To use 1 instead of * would be more efficient
  • Put a write lock around the whole thing and then you won't have any chance of duplicates.
  • @jazzcat select * in this case makes no difference whatsoever because it's being used in an EXISTS clause. SQL Server will always optimize it and has been doing it for ages. Since I'm very old I usually write these queries as EXISTS (SELECT 1 FROM...) but it is not needed anymore.
  • Why does this kind of simple question generate more doubt than certainty?
  • I like EXCEPT SELECT
  • First time i've used EXCEPT. Simple and elegant.
  • But EXCEPT may not be efficient for bulk operations.
  • EXCEPT is not that efficient.