dml

I'm learning how to work with DynamoDB for .net and I have a doubt, Is there a correct way to delete all items from an existing table?, I mean, I don't want to delete the table, just empty it. I've read about batch process but they don't help me much. I have this private string DeleteAllFromTable() { string result = string.Empty; try { var request = new BatchWriteItemRequest { RequestItems = new Dictionary<string, List<WriteRequest>> { { this.Tablename, new List<WriteRequest> { new WriteRequest { DeleteRequest = new DeleteRequest { Key = new Dictionary<string,AttributeValue>() { { "Id", new

In relation to my other question "What’s the best way to audit log DELETEs?" . What's the PostgreSQL equivalent of CONTEXT_INFO? [EDIT] I want to log deletes using trigger, but since i'm not using the database user as my app's logical user, I cannot log the CURRENT_USER from the trigger code as the user who deleted the record. But for INSERT and UPDATE it is possible to log the record changes from trigger since you can just add a user field in the record, say inserted_by and last_updated_by, and use these fields to log to audit table. Milen A. Radev http://www.postgres.cz/index.php/PostgreSQL

Is there any way to combine these two replace values with 1 update statement? UPDATE dbo.MyTable SET MyXmlColumn.modify('replace value of (/node/@att1)[1] with "1"') WHERE id = 1 UPDATE dbo.MyTable SET MyXmlColumn.modify('replace value of (/node/@att2)[1] with "2"') WHERE id = 1 http://msdn.microsoft.com/en-US/library/ms190675(v=SQL.90).aspx harvest316 I dont think you're in luck, Thx. I tried several syntactical variants with no joy. For example, the obvious: SET MyXmlColumn.modify('...'), MyXmlColumn.modify('...') yields: The column name 'MyXmlColumn' is specified more than once in the SET

How do I go about granting DML (SELECT,INSERT,UPDATE,DELETE) on all tables in a schema in PostgreSQL 8.4? I'd also like this grant to persist for new table creation in the future as well. I've seen solutions for 9.0 but I'm stuck with 8.4 as it ships with Debian stable. I have tried the following as a baseline but it doesn't work, resulting in the inevitable "access to relation X denied": GRANT ALL PRIVILEGES ON DATABASE testdb TO testuser; I've dredged through the documentation and I can't seem to find a suitable solution. I'd also like this grant to persist for new table creation in the

一、DML DML（data manipulation language）数据操纵语言： 　　　　就是我们最经常用到的 SELECT、UPDATE、INSERT、DELETE。 主要用来对数据库的数据进行一些操作。 SELECT 列名称 FROM 表名称 UPDATE 表名称 SET 列名称 = 新值 WHERE 列名称 = 某值 INSERT INTO table_name (列1, 列2,...) VALUES (值1, 值2,....) DELETE FROM 表名称 WHERE 列名称 = 值 二、DDL DDL（data definition language）数据库定义语言： 　　　　其实就是我们在创建表的时候用到的一些sql，比如说：CREATE、ALTER、DROP等。DDL主要是用在定义或改变表的结构，数据类型，表之间的链接和约束等初始化工作上 CREATE TABLE 表名称 ( 列名称1 数据类型, 列名称2 数据类型, 列名称3 数据类型, .... ) ALTER TABLE table_name ALTER COLUMN column_name datatype DROP TABLE 表名称 DROP DATABASE 数据库名称 三、DCL DCL（Data Control Language）数据库控制语言： 　　　

这篇文章主要介绍了DDL、DML和DCL的区别与理解，需要的朋友可以参考下 DML、DDL、DCL区别 . 总体解释： DML（data manipulation language）： 它们是SELECT、UPDATE、INSERT、DELETE，就象它的名字一样，这4条命令是用来对数据库里的数据进行操作的语言 DDL（data definition language）： DDL比DML要多，主要的命令有CREATE、ALTER、DROP等，DDL主要是用在定义或改变表（TABLE）的结构，数据类型，表之间的链接和约束等初始化工作上，他们大多在建立表时使用 DCL（Data Control Language）： 是数据库控制功能。是用来设置或更改数据库用户或角色权限的语句，包括（grant,deny,revoke等）语句。在默认状态下，只有sysadmin,dbcreator,db_owner或db_securityadmin等人员才有权力执行DCL 详细解释： 一、DDL is Data Definition Language statements. Some examples:数据定义语言，用于定义和管理 SQL 数据库中的所有对象的语言 1.CREATE - to create objects in the database 创建 2.ALTER - alters the