How SQL statements execute in SQL Server Management Studio with GO and without GO statement?
I have a simple query CREATE TABLE #tempTable (id int) DROP TABLE #tempTable CREATE TABLE #tempTable (id int) DROP TABLE #tempTable From my understanding, in the second part, it should create the #tempTable. But it shows the following error Msg 2714, Level 16, State 1, Line 4 There is already an object named '#tempTable' in the database. I have searched for the reason and found that it is because of a GO statement between the two part of the query. Therefore, the correct query is CREATE TABLE #tempTable (id int) DROP TABLE #tempTable GO CREATE TABLE #tempTable (id int) DROP TABLE #tempTable I have also found that GO just tells SSMS to send the SQL statements between each GO in individual batches sequentially. My question is, how are SQL statements executed? Is it not executed sequentially? If it executes sequentially, then why does my first query cause an error?
The SQL Server documentation does a pretty good job of explaining this. In your particular case, the issue is compile-time errors versus execution-time errors. How does this work? Without a GO separating the statements, all are compiled at the same time. The problem is that the third statement is a CREATE TABLE statement and the table already exists. All that is happened is that the statements are parsed and compiled. With the GO, the first two statements are compiled and executed. Voila! There is no table for the CREATE in the third statement.
The main reason of this error is that parsing the query occurs before executing the query. It happens because the whole code is executed as one batch. And SQL Server has one task to parse and execute. That's why a GO command (not a statement) allows you to avoid this problem. It signals the end of a batch. Here is a good topic to read about it: Understanding how SQL Server executes a query
Select N rows before and N rows after the record
mssql nodejs trustedSecurity
How facebook notify wall updates to fans?
Eloquent with declared table to use in the query
Export Sql Server (64 bit) to Excel (32 bit)
What would be the correct syntax to round decimal quotient values in SQL
dropping SYNONYM is blocking in sql server?
Percent Log Used above threshold
Connect to SQL Server Analysis service through QlikView
Need optimization for a query
ORDER BY in SQLCMD export
Package runs in Visual but not in Job- Buffer Error- Sql server
node js “mssql” request query identify if a row was deleted or not
Accessing prior rows and divide its value by current row
Select Query combining a group select querys in PL/SQL
SQL Server permission error after publishing website from visual studio 2015