alter

Difficulty in upgrading SQlite table

由 喜夏-厌秋 提交于 2019-11-27 09:48:04
问题 I have an application running with a working table called ANIMAL. Upon first creating this table it consisted simply of _id and animal_name columns. Now I am trying to expand on it, including a animal_biography column, however I am having a little difficulty.At first I thought I was just a case of upgrading my CREATE_TABLE statement to include the animal bio: private static final String DATABASE_CREATE = "create table " + ANIMALS_TABLE + " (_id integer primary key autoincrement, " + "animal

How to move columns in a MySQL table?

由 血红的双手。 提交于 2019-11-27 02:44:01
Currently I am having the following MySQL table: Employees (empID, empName, department); I want to change the table to the following: Employees (empID, department, empName); How can this be done using ALTER statements? Note: I want to change only column positions. If empName is a VARCHAR(50) column: ALTER TABLE Employees MODIFY COLUMN empName VARCHAR(50) AFTER department; EDIT Per the comments, you can also do this: ALTER TABLE Employees CHANGE COLUMN empName empName VARCHAR(50) AFTER department; Note that the repetition of empName is deliberate. You have to tell MySQL that you want to keep

How to change all the tables in my database to UTF8 character set?

由 夙愿已清 提交于 2019-11-27 00:44:22
问题 My database is not in UTF8, and I'd like to convert all the tables to UTF8, how can I do this? 回答1: For single table you can do something like this: ALTER TABLE tab CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci; For the whole database I don't know other method than similar to this: http://www.commandlinefu.com/commands/view/1575/convert-all-mysql-tables-and-fields-to-utf8 回答2: mysqldump --user=username --password=password --default-character-set=latin1 --skip-set-charset dbname > dump

Optimize mySql for faster alter table add column

由 人盡茶涼 提交于 2019-11-27 00:16:37
问题 I have a table that has 170,002,225 rows with about 35 columns and two indexes. I want to add a column. The alter table command took about 10 hours. Neither the processor seemed busy during that time nor were there excessive IO waits. This is on a 4 way high performance box with tons of memory. Is this the best I can do? Is there something I can look at to optimize the add column in tuning of the db? 回答1: I faced a very similar situation in the past and i improve the performance of the

How can I alter this computed column in SQL Server 2008?

由 回眸只為那壹抹淺笑 提交于 2019-11-26 21:59:52
问题 I have a computed column created with the following line: alter table tbPedidos add restricoes as (cast(case when restricaoLicenca = 1 or restricaoLote = 1 then 1 else 0 end as bit)) But, now I need to change this column for something like: alter table tbPedidos alter column restricoes as (cast(case when restricaoLicenca = 1 or restricaoLote = 1 or restricaoValor = 1 then 1 else 0 end as bit)) But it's not working. I'm trying to input another condition to the case statement, but it's not

How to remove constraints from my MySQL table?

由 本秂侑毒 提交于 2019-11-26 18:49:30
问题 I want to remove constraints from my table. My query is: ALTER TABLE `tbl_magazine_issue` DROP CONSTRAINT `FK_tbl_magazine_issue_mst_users` But I got an error: #1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'constraint FK_tbl_magazine_issue_mst_users ' at line 1 回答1: Mysql has a special syntax for dropping foreign key constraints: ALTER TABLE tbl_magazine_issue DROP FOREIGN KEY FK_tbl_magazine_issue

How to change column datatype in SQL database without losing data

由 百般思念 提交于 2019-11-26 15:14:27
问题 I have SQL Server database and I just realized that I can change the type of one of the columns from int to bool . How can I do that without losing the data that is already entered into that table? 回答1: You can easily do this using the following command. Any value of 0 will be turned into a 0 (BIT = false), anything else will be turned into 1 (BIT = true). ALTER TABLE dbo.YourTable ALTER COLUMN YourColumnName BIT The other option would be to create a new column of type BIT , fill it from the

Is it possible to alter a CSS stylesheet using JavaScript? (NOT the style of an object, but the stylesheet itself)

由 偶尔善良 提交于 2019-11-26 11:22:34
Is it possible to alter a CSS stylesheet using JavaScript? I am NOT talking about: document.getElementById('id').style._____='.....'; I AM talking about altering: #id { param: value; } besides doing something dirty (which we haven’t tried yet btw), like creating a new object in the head, innerHTML a style tag in there, etc. Although this, even if it did work, would pose a few issues as the style block is already defined elsewhere, and I’m not sure when/if the browser would even parse a dynamically created style block? As of 2011 Yes you can, but you will be facing cross-browser compatibility

Is it possible to alter a CSS stylesheet using JavaScript? (NOT the style of an object, but the stylesheet itself)

由 蓝咒 提交于 2019-11-26 03:31:24
问题 Is it possible to alter a CSS stylesheet using JavaScript? I am NOT talking about: document.getElementById(\'id\').style._____=\'.....\'; I AM talking about altering: #id { param: value; } besides doing something dirty (which we haven’t tried yet btw), like creating a new object in the head, innerHTML a style tag in there, etc. Although this, even if it did work, would pose a few issues as the style block is already defined elsewhere, and I’m not sure when/if the browser would even parse a
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