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10 kwi 2011 · How can I use the DISTINCT clause with WHERE? For example: SELECT * FROM table WHERE DISTINCT email; -- email is a column name I want to select all columns from a table with distinct email addresses.
Within the WHERE clause lies many possibilities for modifying your SQL statement. Among these possibilities are the EXISTS, UNIQUE, DISTINCT, and OVERLAPS predicates. Here are some examples of how to use these in your SQL statements. You can use the EXISTS predicate in conjunction with a subquery to determine whether the subquery returns any rows.
12 lut 2024 · To search for a record that contains a specific word in a specific field, we will use SELECT statement in SQL with WHERE clause to filter the results based on a specific word. Consider a table named products with columns product_id and product_name. We want to select products where the product name contains the word "chair". Query: product_id INT,
29 kwi 2024 · In a database context, “unique” means that each database record (or row) is different from all others. It doesn’t mean that all the values (columns) need to be different from all other rows’ columns; it’s enough that only one column is different to proclaim the row unique. So, what we’re looking at here is the unique combination of values.
5 lis 2014 · I have a table with a text column that can contain a single word, more words separated by a space or a NULL value. I need to get all the distinct words in that column (words non column entries). For getting all the distinct column entries I use. SELECT DISTINCT(col_name) AS col_name FROM table_name ORDER BY col_name ASC
23 lut 2023 · As its name implies, the DISTINCT keyword is commonly used in a SQL SELECT statement to return a distinct set of values. This tip will look at several simple examples of using SELECT DISTINCT that you can copy, paste, and edit for your needs.
Grouping allows you to add aggregated data, like the min(id), max(id), count(*), etc: Using a subquery, you can first identify the duplicate rows to ignore, and then filter them out in the outer query with the WHERE NOT IN (subquery) construct: SELECT distinct d2.id. FROM dupes d1. INNER JOIN dupes d2 ON d2.word=d1.word AND d2.num=d1.num.
