Count case when teradata

I am trying to write a query that will bring back an order number unless there are multiple order numbers with the transaction, which will need to return the word Multiple. Syntax: (Applied on column2) SELECT column CASE columnWHEN valueTHEN resultWHEN valueTHEN resultEND FROM table The CASE functionality must meet END to operate for a table. CASE expression evaluates each row against a condition or WHEN clause and returns the result of the first match. If there are no matches then the result from ELSE part of returned.

Following is the syntax of the CASE expression.

If no condition is matched then TERADATA SQL CASE will result in output specified in ELSE clause. Teradata SQL CASE statement with Example. If ELSE clause is missing then, it will result in NULL as value. In order to get the count value from a column in a table, COUNT function can be used.

Generally, COUNT function will be used with GROUP BY clause to find the count value for each group. In the above example, the count emp_id for every dept_id will be displayed. I need to write a SQL query that sums revenue for only those accounts when total sum of an account Q exceeds Y. Similarly, I also need to count only those accounts when total sum of an account Q exceeds Y.

I use a CASE statement to perform a COUNT all the time. Usually I do this to set a condition, usually time based. CASE allows for conditional processing of returned rows. CASE returns a single result for each row processed.

Each row is evaluated against each WHEN clause. First match returns a result for that row. If no match, ELSE result is produced for that row.

Home Syntax How do you count the number of characters in a string in. They can be used with the SELECT statement. SUM − Sums up the values of the specified column(s) MAX − Returns the large value of the specified column. MIN − Returns the minimum value of the specified column. AVG − Returns the average value of the specified column.

The SELECT query called as inner query executed first and the outer query uses the result from the subquery. Below are the some of the features of the subquery. A query can have multiple subquery or subquery can have another subquery.

Subqueries does not return duplicate records.

Select DISTINCT records by SQL queries: If we need to select only the distinct values for any column, then we can use DISTINCT keyword along with SELECT in SQL Queries. I am having two tables each having columns. I want to compare these two tables tableand tableto get the count of all the records in tableand all therecord in tableand the differnece of records in a single query. Date types are highly formatted and very complicated. Each RDBMS may employ different date functions, and there may also be differences in the syntax for each RDBMS even when the function call is the same.

COUNT : Provides the total number of rows from tables. The following case study shows how the Optimizer can be convinced (or forced) to use collected statistics instead of applying inaccurate heuristics. The case study is based on the following two tables: SHOW TABLE TheDatabase. Count is one of very important functions used in any database.

But what many dont know that is the result count we get from COUNT function might be different based on how it is used. These new functions are designed to be compatible to Oracle. The value that corresponds to the first match is returned.

If no WHEN matches the selector, than the result specified by the ELSE clause expression is returned.