1. What is Master Index and Cylinder Index? Teradata uses logical address system, unlike other DBMS which are physical address system. This allows Teradata to locate the data easily if the data gets reallocated or de-fragmented. Master Index and Cylinder … Read more »
INSTR in Teradata is used to get the position of a search string in the source string. Syntax: select instr( source_string, search_string [,position[,occurrence]]) Example: SELECT INSTR(‘choose a chocolate chip cookie’,’ch’,2,2); The above query will return 20, indicating the position of … Read more »
OTRANSLATE in Teradata: Returns source_string with every occurrence of each character in from_string replaced with the corresponding character in to_string. OTRANSLATE is an embedded services system function. It can be activated by invoking embedded services functions Expressions passed to this … Read more »
Oreplace in Teradata is used to replace every occurrence of matching string with the new string in Teradata. Oreplace is mainly used to either to replace of remove portions of a string. Oreplace Syntax: SELECT oreplace(‘source_string’,’string_to_replace’,’new_string’) Oreplace Example: SELECT oreplace(‘TeradataPoint’,’Point’,’Tutorial’); … Read more »
As a Teradata Admin or Developer you may want to know the database space utilization in Teradata system. This will provide a clear picture about how the spaces are allocated over the different databases. Following Teradata database space query will … Read more »
Joins mean joining more than one table based on the common columns/values from these tables. Joins are helpful to get meaningful data for business queries. Teradata supports different kinds of join as below. Inner Join. Left Outer Join. Right Outer … Read more »
Teradata RANK function assigns the ranking(1…n) of rows in the result set based on the value of the sort_expression list. The rows with the same value receive the same rank in Teradata. You may also specify the sorting order in … Read more »
The Qualify clause filters the results of a previously computed ordered analytical function according to user-specified search conditions. The Qualify clause works similarly to the HAVING clause. But the major difference between Qualify and HAVING is that with Qualify the … Read more »
ABS function calculates the absolute value of a given value. ABS Function in Teradata Syntax ABS(number_value) ABS Function in Teradata Example SELECT ABS(10); Output: 10 SELECT ABS(-10); Output: 10 SELECT ABS(+10) Output: 10 Teradata ABS function converts the negative value … Read more »
The identity column in a table defines a column that generates the value automatically once you define that column as Identity. You do not require to insert any values explicitly for the Identity column. Teradata itself takes care of the … Read more »