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jimbabwe.co.za | ||
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jsloop.net
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| | | | | Let's say our objective is to get latest one row by a given set of criteria. Means, say a person has multiple products and we want to get latest one product per person. For this what we need to do is partition the data by the required criteria. Here we will partition the data by person_id and product_type ordered by latest org_insert_dt. This will order the result by person and latest product. Then we use row_number() function which will assign unique, sequential integer to each partition in the result set. Which means the latest product for each person will get a 1. And we use a CTE (Common Table Expression), which is temporary named result set to store this relationship. Now if we need latest product per person, then we can query this CTE which is like a t... | |
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boringsql.com
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| | | | | Unlock powerful data analysis in PostgreSQL with window functions. Go beyond aggregates to rank, calculate running totals, and compare rows directly within your queries. | |
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barneylawrence.com
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| | | | | FIRST_VALUE and LAST_VALUE had limited uses when they were first released to the world back in 2012, but with the introduced of the ability to ignore nulls in SQL Server 2022 they become a lot more useful. Let's take a look at some examples of why. | |
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www.talend.com
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| | | Data modeling is the process of creating a diagram that represents your data system & defines the structure, attributes, and relationships of your entities. | ||
