Difference between Alter and Update SQL - Stack Overflow
Mar 12, 2014 · UPDATE updates data stored in the row in the database table; ALTER is used to change the database table's structure - e.g. add a column, add or drop a constraint - it has …
sql server - Updating a column using between - Stack Overflow
Sep 2, 2010 · If you are using SQL Server (or one of several other databases), you shouldn't bother with a class column. Instead, use a computed column: alter dbo.tablename add class …
What are differences between INSERT and UPDATE in MySQL?
Jan 4, 2010 · In CRUD operations, the INSERT is the 'C' and the UPDATEis the 'U'. They are two of the four basic functions of persistent storage. The other two are SELECT and DELETE. …
What are the differences between REPLACE, INSERT, UPDATE in …
Apr 20, 2017 · Update: Update existing record. Replace: works exactly like INSERT, except that if an old row in the table has the same value as a new row for a PRIMARY KEY or a UNIQUE …
sql - alter table then update in single statement - Stack Overflow
Apr 1, 2013 · ALTER TABLE A ADD c1 int,c2 varchar(10) UPDATE A set c1 = 23, c2 = 'ZZXX' I need to run the above two queries at a time. I am using Talend ETL tool, in this we have a …
sql - DROP...CREATE vs ALTER - Stack Overflow
Oct 29, 2009 · However, an alter procedure will wait for all queries to stop using the stored proc, and then alter it. If the queries are "locking" the stored proc for too long (say a couple …
MySQL ALTER TABLE: ALTER vs CHANGE vs MODIFY COLUMN
Apr 4, 2014 · Whenever have to change a column in MySQL (which isn't that often), always forget the difference between ALTER COLUMN, CHANGE COLUMN, and MODIFY COLUMN. …
mysql - `MODIFY COLUMN` vs `CHANGE COLUMN` - Stack Overflow
Feb 8, 2013 · The difference is whether you want to change the column name, column definition or both. CHANGE. Can change a column name or definition, or both ALTER TABLE t1 …
what is the difference between 'alter table rename' and 'rename …
As documented under ALTER TABLE Syntax: For ALTER TABLE tbl_name RENAME TO new_tbl_name without any other options, MySQL simply renames any files that correspond to …
sql - Insert and alter in one statement - Stack Overflow
Jul 8, 2013 · It's SQL Server in the cloud, i.e. Azure. I'm going to give MERGE a whack and you're welcome to post the comment as a reply so I can check it as an answer if the suggestion …