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WHEN rn < 5000 THEN rn%100 - selects values between 0 and 100 for the first 5000 rows. Rn = ROW_NUMBER() OVER(ORDER BY (c.)) -1 - generate 100K records starting from 0įROM sys.all_columns c, sys.all_columns c1 *SQL Server 2019 CTP3, Compatibility level 150 */ The same applies for ProductId 6000, or 3 different ProductIds. The number of orders makes 20% of all orders. ProductId=40000 participates in 20,000 orders. The same applies for ProductId 100,200,300 …4900, or 50 different ProductIds. The number of orders makes 0.1% of all orders. ProductId = 0 participates in 100 Orders. The script below creates a sample table with the following ProductId data distribution.
#With recompile stored procedure code#
If the product is not included in any of the sales Orders, the code returns nothing or a warning message. Take for example a simple, non-production process that selects all orders and their details associated with a productId. Our TSQL code may implement logic which use conditional branching to decide what business rule to apply. Conditional branching in stored procedures In this post I’ll try to explain how Query optimiser handle queries in different conditional branches and how it relates to the option(recompile) hint and the procedure plan.
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There are many cases when programmers use conditional branching in tsql code to execute different queries or similar queries with different predicates based on a certain condition. plan is generated for all branch pathsĬonditional branching and OPTION(RECOMPILE)
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Conditional branching in stored procedures.Conditional branching, OPTION(Recompile) and procedure plan.