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24 cze 2019 · If you need to refer to the CASE expression in the WHERE clause, then you have two choices. First, you may subquery your current query, and assign an alias to the CASE expression: SELECT * FROM ( SELECT CASE WHEN ...
CASE WHEN c1=var1 OR (c1 IS NULL AND var1 IS NULL) THEN 'a' WHEN c1=var2 OR (c1 IS NULL AND var2 IS NULL) THEN 'b' ELSE NULL END. DECODE (c1,var1, 'a', var2, 'b') CASE expressions allow an expression to be selected based on the evaluation of one or more conditions.
A CASE expression allows you to select an expression based on evaluation of one or more conditions. In other words, it allows you to add the if-else logic to your queries. Db2 supports two kinds of CASE expressions: simple CASE and searched CASE expressions.
You can combine any two predicates with AND and OR. In addition, you can use the NOT keyword to specify that the search condition that you want is the negated value of the specified search condition. A WHERE clause can have as many predicates as you want.
In general, the value of the case-expression is the value of the result-expression following the first (leftmost) when-clause that evaluates to true. If no case evaluates to true and the ELSE keyword is present, the result is the value of the result-expression or NULL.
11 lut 2016 · I am using a CASE expression in my WHERE clause like this: SELECT * FROM ASPECT.WR_AM_ADT_SUMM INNER JOIN ASPECT.WR_AM_DLR_DTL ON AS_CNTRY_CD = DD_CNTRY_CD AND AS_DLR_CD = DD_DLR_CD AND AS_YEAR = DD_YEAR RIGHT JOIN ASPECT.DEALER_MASTER ON COUNTRY_CD = AS_CNTRY_CD AND DEALER_CDE_VEGA = AS_DLR_CD WHERE COUNTRY_CD = '81930' AND LANG_CD = '02' AND ...
20 sie 2024 · The CASE statement in SQL is a conditional statement that allows us to specify conditions and return different values based on whether those conditions are met. There are two main forms of the CASE statement: Simple CASE: Compares an expression to a set of simple expressions to determine the result. Searched CASE: Evaluates a set of Boolean ...
