Create table IF NOT EXIST
My task was to create the monthly backup of data in MS Access database with local tables (no links to SQL Server) and all functions of MS Access database should stay in place including Reports, Queries, Macros, Modules, Specification, and Tool Bars. -user uage (how often a user made connection to the database) -table uage(what tables are accessed by this user) -space usage on the database and table (how big is it? How much free space?) THanks
SQL Server T-SQL Tuning - NOT IN and NOT Exists - SQL Server Performance
Much informative!! Phil Reply January 16, 2013 at 8:20 am It would be nice to see some test results which back up your assertions, using sample data with hundreds of thousands of rows. This can however have a major impact on performance as the Not IN command requires a check to be made on each record individually resulting in a strain on resources and can also lead to locks particularly when updating or deleting a large volume of data
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SQL Server: EXISTS Condition
Syntax The syntax for the EXISTS condition in SQL Server (Transact-SQL) is: WHERE EXISTS ( subquery ); Parameters or Arguments subquery The subquery is a SELECT statement. Note: SQL Server SQL statements that use the SQL Server EXISTS condition are very inefficient since the sub-query is RE-RUN for EVERY row in the outer query's table
SQL SERVER: Check If Temporary Table Exists
http://sqlservercodebook.blogspot.com/2008/03/check-if-temporary-table-exists.htmlHow can I find the last day of the month How To get the comma delimited list: Returning String Instead of NULL: User Define Function For Converting Column Value i..
But if you are running something once, and then discarding it (creating a table, just want to get some information, etc) then I dont see any issue with using the system tables
create table if it does not exist
My task was to create the monthly backup of data in MS Access database with local tables (no links to SQL Server) and all functions of MS Access database should stay in place including Reports, Queries, Macros, Modules, Specification, and Tool Bars. I look at partition table like the Encyclopedia Britannica; imagine that Encyclopedia Britannica was one very thick heavy book :-) That would be very hard to use, instead Encyclopedia Britannica is broken down into volumes logically separated by the Alphabet
SQLite Query Language: CREATE TABLE
If an INSERT statement attempts to insert a NULL value into a rowid or integer primary key column, the system chooses an integer value to use as the rowid automatically. Each time a row is inserted into the table by an INSERT statement that does not provide explicit values for all table columns the values stored in the new row are determined by their default values, as follows: If the default value of the column is a constant NULL, text, blob or signed-number value, then that value is used directly in the new row
MySQL :: MySQL 5.1 Reference Manual :: 13.1.17.2 CREATE TABLE ... SELECT Syntax
This change in handling of IF NOT EXISTS results in an incompatibility for statement-based replication from a MySQL 5.1 master with the original behavior and a MySQL 5.5 slave with the new behavior. (If the SELECT in the original statement is preceded by IGNORE or REPLACE, the INSERT becomes INSERT IGNORE or REPLACE, respectively.) This change provides forward compatibility for statement-based replication from MySQL 5.1 to 5.5 because when the destination table exists, the rows will be inserted on both the master and slave
*l.value3 and r.value2 are not comparable (although there might exist a correlation) *l.value3 is nullable (which I think is not a big deal because the condition is out of the NOT IN clause). So with the join you would want when r.value is not null For Each r.value ALL r.value2 1 (this part is hard to explain: just remember that r.value can have multiple r.value2 associated to it and we want all of them to be different from 1) So now I am stuck searching for a way to express existential and universal conditions
MySQL :: MySQL 5.1 Reference Manual :: 13.1.17 CREATE TABLE Syntax
In that case, the (child table) row containing such a foreign key is permitted to be inserted, and does not match any row in the referenced (parent) table. For each InnoDB table created when this option is turned on, the table data and all associated indexes are stored in a .ibd file located inside the database directory
If you are going to do a lot of updating and it will be rare that the record does not exist, it is going to be best to try updating first and if no records are updated, insert one. hi,Actually I want a sql statement to update evary 10000 rows of a record....for eg...if a record consists of 30000 rows.....we created a new column in that record.....in that column we want to place the value 1 for first 10000 rows and the value 2 for next 10000 rows and the value 3 for next rows....and so on.....i.e., the value should be incremented by 1 for every 10000 rows....please help in this as quickly as possible...
Check if Database Exists
ELSE by using WHERE EXISTS Using WHERE EXISTS Drop Temp Table If Exists Drop Table if Exists Rebuild and Reorganize Fragmented Indexes Making a Procedure Available in all Databases Blocking Processes (lead blocker) Reindex All Tables in a Database The database principal owns a schema in the database, and cannot be dropped. Reply to this comment Home Tuning Services Featured Articles How to cache stored procedure results using a hash key There are a lot of different design patterns that lend themselves to creating SQL Server Database Optimization Guide In the troubleshooting guide we went over the different physical bottlenecks that can Yet Another Temp Tables Vs Table Variables Article The debate whether to use temp tables or table variables is an old Using Union Instead of OR Sometimes slow queries can be rectified by changing the query around a bit
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How to drop a table if exists in a SQL Script
Consider than SQLCe is single-user so you'll have to separate the test (does the table already exist) from the SQL that does the work (DROP TABLE then CREATE TABLE or just CREATE TABLE)
There's some fancy word for this that I used to try and use so as to appear ostentatious but it turns out people found me ostentatious even when I didn't use the word so I concluded I didn't need to use it anymore and erased it from my memory
Uh! I almost felt like going back in time some ten years when I was writing kernel drivers for Windows :) This is excellent participation from experts like Marko and Brian. Is it better write a function Drop table and and pass table name as parameter to do this? In my opinion, I think it is expensive to go to a function from a stored procedure just to drop a table
SQL Server Forums - SQL Error: IF NOT EXIST.. CREATE VIEW
It is smart enough to try an validate your statements and check your syntax before the code is actually attempted, but it is not smart enough to realize the conditional nature of the CREATE statement
Xaprb How to write INSERT IF NOT EXISTS queries in standard SQL Sun, Sep 25, 2005 in Databases If necessary, INSERT IF NOT EXISTS queries can be written in a single atomic statement, eliminating the need for a transaction, and without violating standards
sql query to create table if not exist
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sqlite: IF EXISTS clause Local SQL
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I don't feel like it's safe to assume there are no special permissions assigned and just pave over those objects, even if there's a policy like that in place. Conclusion I do wish SSMS had better and more sophisticated support for scripting these clauses, but, lacking that, I resort to a small library of these and look them up
Query to check Database, Table, Column exists in Sql Server Introduction In Database if we try to create a new Database,new Table, or new Column without knowing the existence of it will lead to error it will create some frustration if you cannot a anyone of the above listed with a name that you intended to use.This tip will surely help you to overcome this frustration and you can check whether database server has the database or Table already exist before creating or accessing. Background When I was instructed to access database in remote server, no one knows whether the database exists in remote server or not, without knowing how can I access the database? This question helped me to write this tip to verify the existence of the Database
Sys.Tables will return the rows only for the Table objects whereas Sys.Object view apart from returning the rows for table objects, it returns rows for the objects like: stored procedure, views etc. Approach 5: Avoid Using sys.sysobjects System table We should avoid using sys.sysobjects System Table directly, direct access to it will be deprecated in some future versions of the Sql Server
IF table exists, DROP TABLE then CREATE TABLE - script not working
The script is designed to be run as a whole whether or not the customer has run it before.The purpose of the script is not to rename the column, but rather to build the necessary objects. David Edwards - Media lensSociety has varying and conflicting interests; what is called objectivity is the disguise of one of these interests - that of neutrality
Drop Table if Exists
Name: Email: Comment: Home Tuning Services Featured Articles How to cache stored procedure results using a hash key There are a lot of different design patterns that lend themselves to creating SQL Server Database Optimization Guide In the troubleshooting guide we went over the different physical bottlenecks that can Yet Another Temp Tables Vs Table Variables Article The debate whether to use temp tables or table variables is an old Using Union Instead of OR Sometimes slow queries can be rectified by changing the query around a bit
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