SQL DISTINCT SELECT eliminates duplicate records from the results, return only distinct (different) values.DISTINCT aggregates: COUNT, AVG, MAX, etc.
I have tow tables, tblItem and tblInsertLines, in tblInsertLines I have the same ItemId but with differnt ProdDate and ExpireDate, I want to get a distinct list of all items but select the first row from tblInsertLines as the first row contains the oldest ProdDate. Any help will be...
SELECT DISTINCT agent_code, ord_amount, cust_code: This line specifies that you want to retrieve unique combinations of 'agent_code', 'ord_amount', and 'cust_code'. The DISTINCT keyword ensures that only unique combinations are returned; any duplicate combinations will be eliminated. FROM order...
4. albums.artist_id = artists.id: is the join condition that describes how the two tables are related to each other. Here, SQL uses the foreign key column "artist_id" in the "albums" table to match it with exactly one row in the "artists" table with the same value in the "id" ...
-- DISTINCT 可以用来去掉重复的,只列出单一的项 practice -- Return all the products -- name -- unit price -- new price (unit price*1.1) SELECT name, unit_price, unit_price*1.1 AS 'new price' FROM products 第二节: the where clause ...
Copy tables with all constraints Correct way to run multiple sql scripts from one 'master' script? with logs etc. Could #TempTable within SP cause lock on tempdb? Could not complete cursor operation because the table schema changed after the cursor was declared Could not continue scan with NO...
Sorts on a table with Columnstore index are in Row mode Windowing function aggregates operate in row mode such asLAGorLEAD Queries on Columnstore tables with Multiple distinct clauses operated in Row mode Queries running under MAXDOP 1 or with a serial plan executed in Row mode ...
Suppose we have a table with multiple columns and we want to count the number of distinct combinations of values across these columns. For example, let’s consider a table of sales data with the customer_id, product_id, and date columns. We want to count the number of unique combinations...
The post covers counting based off DISTINCT clauses and the pitfalls one needs to be aware of:COUNTing with the DISTINCT Clause. I hope some of your educated audience can get something out of it to add to their knowledge base. Thanks...Troy ...
SQL_AF_DISTINCTSQL_AF_MAXSQL_AF_MINSQL_AF_SUMSQL-92 入口级别一致性驱动程序将始终按支持返回所有这些选项。 SQL_ALTER_DOMAIN 3.0 SQLUINTEGER 位掩码,枚举数据源支持的 SQL-92 中 ALTER DOMAIN 语句中的子句。 SQL-92 完全兼容级别的驱动程序将始终返回所有位掩码。 返回值为“0”表示 不支持 ALTER ...