Comparison between the with clause of teradata and oracle supports multiple with clauses in the following format: With t1 as (select ....), With t2 as (select ....), ..... With tn as (select ....) Select * from t1 ...... The column names are not listed after the temporary table name www.2cto.com. The clauses are separated by commas. The last with clause and select are not separated by commas. Teradata suppo
When foreign banks enter the Chinese market, they often adopt differentiated service strategies, that is, they use standardized products, advanced management and services, and advanced information technology to win local gold customers and then expand the market. This requires domestic commercial banks to strengthen the construction of analytical application systems, strengthen business management and decision-making analysis, understand customer needs and credit risks, and develop new products
Position Title: TRM Automation Developer
Responsibility:
• Responsible for Teradata Relationship Management (TRM) automation testing.
• Develop and maintain the test automation framework.
• Develop and sustain automated testing including Web Service and integrated functional tests.
• Investigate automation results to identify application/automation issues or bugs.
• Identify framework or other automation issues and provide/develop extensions to the
Teradata data contains newline characters causing query results to export serial issuesDuring the daily operation of the system, part of the data is read into Excel import into the production system. This results in a mixed data quality. Some Excel cells have line breaks, data import, when queried again, it is possible to export the results of data serial problem.First to restore the problem. (no solution has been found ...). T_T)Write SQL and run the
Full teradata transformation in the big data age
[Key Point]: technologies and solutions related to data analysis ==> helping enterprises realize data value realization
1. All enterprises reach consensus
Data has become an enterprise's asset or even a core asset.
2. teradata Transformation
For data analysis vendors such as teradata, providing data analysis-relate
association conditions)6. Try to use exists or not exists instead of in or not in.7. When selecting distinct and group by, consider: if the result set of distinct occupies most of the original table, select distinct; otherwise, use group, generally, use group by as much as possible.8. When writing the SELECT statement, try to write the specific field as much as possible, and avoid writing the "select *...
Today, try to connect Teradata directly with JDBC, and quote the following error:
Gssexception:failure unspecified at GSS-API level (mechanism level:userfile parameter null) at COM.TERADATA.TDGSS . Jtdgss.
Tdgssparsexml.
After a while, I found that the original Teradata need 3 packages, and I only gave 1 packages.
Terajdbc4.jar
Tdgssjava.jar
Tdgssconfig.jar
To tell you the truth, I think Tera
A basic principle for massive data performance optimization is "Partitioning" (also called "Partitioning ). The idea of partitioning is actually the principle of drawer in daily work and life: we put our items into multiple small draws according to some logic.
A basic principle for massive data performance optimization is "Partitioning" (also called "Partitioning ). The idea of partitioning is actually the principle of drawer in daily work and life: we put our items into multiple small draws ac
Oracle, mysql, teradata paging method/*** add paging information to the original SQL statement * @ param SQL the SQL statement to add paging * @ param start the start position of the record * @ param limit the record to be displayed number * @ return: converted SQL */public static String addPageForOracle (String SQL, int start, int limit) {int end = start + limit; SQL = "select * from (select t. *, rownum rn from ("+ SQL +") t where rownum
=Employee_p; modifyUserEmp03AsProfile=Null; 6. Priority of USER Parameters (1) Specify the database or account ID at the session level (2) User parameters specified in profile (3) User parameters specified by the create user or modify user statement 7. Create a complete profile instance Create Profile employee_p As Account = ( ' $ M0_educ S D H ' , ' $ L0_educ S D H ' ) Default Database = Hr_vm Spool = 1e9 Temporary = 500e6 Password = (Expire = 90 , Minchar =
Recently learned SQL in Teradata environment. Here to record the study of the knowledge points, as a record.Directory:
About SQL learning and the online database used
Table Union (join)
SQL Sub-query
Create a new field at select (as, Case time)
Data Grouping (group BY + aggregate function count, SUM, AVG, etc.)
Use over (partition by) to group data and create new fields
Sample Selection
1. About SQL learning and t
thought to never change
FOREIGN keyThe relationship between the foreign key indicators tableFOREIGN KEY rules:
Foreign keys are optional
A table may have more than one foreign key
A foreign key may consist of more than one column
Foreign keys allow duplicate values to occur
Foreign keys allow null values
The value of the foreign key may change
The value of each foreign key must exist in a primary key
These terms are not unique to
Label: --whether the database exists
IF exists(SELECT * fromMaster.. sysdatabasesWHEREName=N'Library name')
PRINT 'exists'
ELSE
PRINT 'Not exists'
---------------
--determine if the name of the table to be created exists
IF exists
In SQL, there are three types of in:
1. For example, select * from T1 where F1 in ('A', 'B') should be more efficient than the following two
Select * from T1 where F1 = 'A' or F1 = 'B'
Or select * from T1 where F1 = 'A' Union all select * from T1 F1 = 'B'
You may not be referring to this category. We will not discuss it here.
2. For example, select * from T1 where F1 in (select F1 from T2 where t2.fx = 'X '),
The condition in the WHERE clause of the subquery is not affected by the ou
Label:Source of the blog post (exists and not EXISTS usage in Oracle): http://chenshuai365-163-com.iteye.com/blog/1003247 Bowen Source (in VS. exists statement efficiency issues): http://www.cnblogs.com/iceword/archive/2011/02/15/1955337.html A exists (SQL returns the result set as true) NOT
Simply put, not exists = not in; exists = in
However, this is just a simple understanding. There are still some differences between the execution mechanism and the details in it!
The following is an excerpt from the network:Article:
SQL Exists and in,
Not Exists and
Not In Efficiency Comparison and usa
SQL query in the in, exists, not in, not exists usage and difference, sqlexists
1. in and exists
In connects the External table to the internal table as a hash (Dictionary set), while exists loops the External table and queries the internal table after each loop. The statement that
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