Teradata select unique vs distinct

Sep Hi, Could anybody explain me the difference between UNIQUE and DICTINCT keywords? Exists any command to detect a index definition on . Selecting all rows that have a unique column Sep difference between distinct and group by May Re: Selecting all rows that have a unique column - Page. Feb count of distinct Jul More from community. Unique was the old syntax while Distinct is the new syntax,which is now the Standard sql. UNIQUE is keyword for adding unique constraint on the column.

Unique creates a constraint that all values to be inserted must be different from the others. Teradata SQL - select distinct returning duplicate. Oct More from stackoverflow.

The next SELECT uses DISTINCT to return only one row for display when a value exists:. Lastly, the NULL is considered a unique value whether there is one row or. GROUP BY versus DISTINCT for eliminating duplicate rows.

The COUNT DISTINCT function returns the number of unique values in the column or expression, as the following example shows. This means: use DISTINCT in case the grouping columns are unique or . Applicable to all values. DISTINCT clause, the query will return the unique values for that expression. Oct You can run a simple query for distinct and group by. SELECT DISTINCT agent_code, ord_amount,cust_code.

Distinct to find unique records and group by for analytic functions . Apr Count distinct is the bane of SQL analysts, so it was an obvious. The more unique pairs there are — the more data rows are unique. They are NOT DISTINCT if they have the same value or if both of them are NULL.

Oct RANK(): This one generates a new row number for every distinct row,. ROW_NUMBER() OVER (window) . If the DISTINCT columns are nearly unique , then DISTINCT may . A primary key is a column of table which uniquely identifies each tuple (row) in that table. Unique key constraints can accept only one NULL value for column.

The query that I have is something . An XMLAGG DISTINCT returns a concatenated string composed of all the distinct ( unique ) values for string-expr in the selected rows: XMLAGG( DISTINCT col1). I have to compute COUNT DISTINCT of customers, per month, and YearToDate. Cumulative distinct count mean if the column value is already counted in. In the WHERE clause, subqueries help select the rows from the tables listed in the. For a table that has two rows in the Country teradata count distinct column United.

Hot Network Questions Disabling Resource Governor If. The WITH clause defines named relations for use within a query. If the argument DISTINCT is specified only unique rows are included in the combined result . The SQL SELECT statement returns a result set of records from one or more tables. According to PostgreSQL v. SQL Window function performs a calculation across a set.

When sort_key is unique , each row will always get a unique row number.