alter-table_开发者

DBI: alter table - question

#!/usr/bin/env perl use warnings; use 5.012; use DBI; my $dsn = \"DBI:Proxy:hostname=horst;port=2000;dsn=DBI:ODBC:db1.mdb\";[详细]

2023-02-16 20:58 分类：问答

sqlite3 alter command delete my db

In the begininng of my app, i am running a sqlite3 command on existing sqlite3 DB. The command goes like that:[详细]

2023-02-15 04:29 分类：问答

Add a column if it doesn't exist to all tables?

I\'m using SQL Server 2005/2008.I need to add a column to a table if it does not yet exist. This will apply to all tables in a given database.I hoped I was close, but I\'m having issues with this solu[详细]

2023-02-13 19:01 分类：问答

SQL Server 2005 - T-SQL to increase field size based on parameters

I\'m wondering if there is a way to loop through all of the columns in a table and increase the size of each field based on what the current size. Basically, I need any fields that currently have a fi[详细]

2023-02-12 21:36 分类：问答

ADD column if none exists in MySQL

I figure this is very easy, but I am trying to run this command only if those columns already don\'t exist:[详细]

2023-02-12 04:48 分类：问答

MySQL How to add a new multicolumn index to an innodb table without triggering a repair?

I have an innodb table that contains 70 million records and already has several single column indexes. I want to add a new multicolumn index that would allow me to run queries on multiple columns. I d[详细]

2023-02-12 03:47 分类：问答

Adding column to Oracle OLTP table

I\'m attempting to add a nullable column 开发者_运维知识库to a frequently used table in an Oracle 10 OLTP database while the application is running and busy.Adding a nullable column is only a data dic[详细]

2023-02-09 10:13 分类：问答

Is it possible to Add column to multiple table simultaneously?

I am using SQL Server. I want to add a single column named [DateCreated] to multiple tables. Is it possible that with a single statement I could add this column to all the tables in my database?[详细]

2023-02-07 02:02 分类：问答

Make column auto_increment and reposition

Hey. I\'m currently learning to use MySql and have a couple of questions. 1) How do I update a column (empty table) to make it an AUTO_INCREMENT column? I tried[详细]

2023-02-03 00:33 分类：问答

Using MYSQL replication to speed up Schema changes and table optermise

I hear that many people use master - slave arrangements help to improve time taken when changing schemas by using replication to setup a new temporary master, then stopping relocation and then swappin[详细]

2023-01-27 23:46 分类：问答