rdbms

XSD to MySQL Schema

由 强颜欢笑 提交于 2019-12-02 06:17:25
问题 I need to convert an XML to a MySQL DB Schema. I have been able to generate the XSD from the XML. Now i want to use the XSD to generate the DB schema in MySQL or PostgreSQL. Can anyone tell me how can i do this or point to any tools which i can use for this? 回答1: There is a command-line tool called XSD2DB , that generates database from xsd-files, available at sourceforge. For more info: please refer to this existing question How can I create database tables from XSD files? 来源： https:/

XSD to MySQL Schema

由 社会主义新天地 提交于 2019-12-02 01:53:24
I need to convert an XML to a MySQL DB Schema. I have been able to generate the XSD from the XML. Now i want to use the XSD to generate the DB schema in MySQL or PostgreSQL. Can anyone tell me how can i do this or point to any tools which i can use for this? Siva Charan There is a command-line tool called XSD2DB , that generates database from xsd-files, available at sourceforge. For more info: please refer to this existing question How can I create database tables from XSD files? 来源： https://stackoverflow.com/questions/7614121/xsd-to-mysql-schema

Sqoop import as OrC file

由 那年仲夏 提交于 2019-12-01 18:13:11
问题 Is there any option in sqoop to import data from RDMS and store it as ORC file format in HDFS? Alternatives tried: imported as text format and used a temp table to read input as text file and write to hdfs as orc in hive 回答1: At least in Sqoop 1.4.5 there exists hcatalog integration that support orc file format (amongst others). For example you have the option --hcatalog-storage-stanza which can be set to stored as orc tblproperties ("orc.compress"="SNAPPY") Example: sqoop import --connect

Sqoop import as OrC file

由 三世轮回 提交于 2019-12-01 17:49:46
Is there any option in sqoop to import data from RDMS and store it as ORC file format in HDFS? Alternatives tried: imported as text format and used a temp table to read input as text file and write to hdfs as orc in hive At least in Sqoop 1.4.5 there exists hcatalog integration that support orc file format (amongst others). For example you have the option --hcatalog-storage-stanza which can be set to stored as orc tblproperties ("orc.compress"="SNAPPY") Example: sqoop import --connect jdbc:postgresql://foobar:5432/my_db --driver org.postgresql.Driver --connection-manager org.apache.sqoop

Lotus Notes XPages for design and Oracle (or other RDBMS) for data

由 房东的猫 提交于 2019-12-01 17:40:59
问题 I plan to make an web application using XPages for the design (plus the Lotus Notes Elements), but instead of storing the data in Lotus Notes, I will store the data in a RDBMS (specifically an Oracle Database). As you can see, I want to create a clear separation between the design and data. Is there a way I can do this? I mean, is there a way I can use Oracle as the data source and XPages/Lotus Notes for the UI only? Thanks a lot! 回答1: There actually has been native support for RDBMS/JDBC

Is there any equivalent to Postgresql EVERY aggregate function on other RDBMS?

由 人盡茶涼 提交于 2019-12-01 16:30:52
问题 Documentation for EVERY aggregate: every(expression) : true if all input values are true, otherwise false http://www.postgresql.org/docs/9.1/static/functions-aggregate.html EVERY is semantically equivalent to COUNT(conditionIsTrue) = COUNT(*) select person_id, every(visited_site = 'http://stackoverflow.com') as visited_same_site_forever, count(case when visited_site = 'http://stackoverflow.com' then '^_^' end) = count(*) as visited_same_site_forever2 from z group by person_id order by person

Microsoft SQL Server to Oracle Data Migration (Conversion) (Other RDBMS ok, too)

由 时间秒杀一切 提交于 2019-12-01 11:56:20
Can you please give some tips or guidelines, best practices for MicroSoft SQL server to Oracle Data Migration? IMHO, it is something that comes best with experience. So I would like to benefit from your experience. Please share any insights that you have into design, modeling, testing or tuning for a data migration project. I would really appreciate if you share your experience even if it is not between these two RDBMSs. Oracle offers a free IDE, SQL Developer, which includes a Migration Workbench to support moving data from MS SQL to Oracle. Check it out. 来源： https://stackoverflow.com

How to insert multiple rows in the same table-Oracle 10g

由 |▌冷眼眸甩不掉的悲伤 提交于 2019-12-01 05:11:32
I created a table in Oracle SQL : create table t1 ( empno number(6) PRIMARY KEY, empname varchar(30), hiredate date, basic number(8), deptno number(4) ); And now I am inserting values into the table using a single query : insert into t1 values((131309,'HP','20-FEB-04',2000000,1235) (131310,'HT','20-APR-14',120020,1234)); But this shows error: insert into t1 values((131309,'HP','20-FEB-04',2000000,1235), * ERROR at line 1: ORA-00907: missing right parenthesis How do I correct this? An INSERT VALUES statement always inserts exactly 1 row. If you want to insert multiple rows with hard-coded

Difference between Relational Algebra and Relational calculus

由 孤街醉人 提交于 2019-12-01 04:44:36
What is the exact difference between relational algebra and relational calculus. At most of the reference, it will be Relational algebra is procedural and calculus is non procedural . So, what is these stands for. However, we can solve all the problems using relational algebra. Then why we would use relational calculus. Except definition, Explanation with example is much appreciated. TL;DR: Queries calling RA (relational algebra) operators & queries of the two relational calculi (RCs) TRC (tuple RC) & DRC (domain RC) are different syntax for the same thing: a relation value or the property

Difference between time-series database and relational database

由 ∥☆過路亽．° 提交于 2019-11-30 18:04:52
I have read some concept about time-series database and some answers about the differences between these 2 but I can't still get my head around these differences. How data is written and stored to disk that make the differences between time-series database and rdbms? What are the best use cases for time-series database over rdbms and VICE VERSA?. I mean the cases that make the time-series database provide outstanding performance over rdbms, also I want to know the cases that rdbms is a more suitable choice than time-series database. Time Series Database Advantages: Throughout 100K+ to 1M+
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