DECODE has some strange behavior: 'In a DECODE function, Oracle considers two nulls to be equivalent.' That behavior is not mentioned in the TechOnTheNet. You are usually better off with the official documentation, and the page for DECODE is a good example of why. In other words, the DECODE() function never evaluates a search (si+1) when a previous search (si) equals e. But I disagree about using TechOnTheNet as your primary source of information. If expression is equal to a search, then the corresponding result is returned by the Oracle. , or sn) only before comparing it to the first argument (e), rather than evaluating all search values. DECODE compares the expression to each search value one by one. The DECODE() function evaluates each search value (s1, s2. You can use expressions for the search (s), the result (r), and default value (d) in the DECODE() function. The DECODE() function returns a value with the data type of the first result (r1, r2. dĭ is an expression to return when e does not equal to any searched value s1, s2. The r1, r2, …, or rn is the expression to return when e is equal to s. Note that s2, s3, … sn are automatically converted to the data type of s1 before comparing. The s1, s2, … or sn is an expression to search for. The function automatically converts e to the data type of s1 before comparing. The first argument e is the value to be searched. It is possible to use DECODE, but you'd have to use nested DECODEs and you'd end up with something that's much harder to.
select 1 value1, case when 'a' 'a' and 'b' 'b' then 'pass' else 'fail' end result from dual VALUE1 RESULT - 1 pass. DECODE, NVL, and NVL2 Most of Oracle's built - in functions are. The simplest answer is don't use decode, use a case statement instead, e.g. , ) Ĭode language: SQL (Structured Query Language) ( sql ) Arguments e CHAPTER 9 DECODE and CASE Whether it is for user presentation, report formatting. On web.oid_web_activity_fct = o.DECODE (e, s1, r1. On WEB.OID_WEB_ACTIVITY_FCT = C.OID_SILVERPOP_CLICK SUM(case when WEB.EVENT_TYPE in(5,6,7,8)then WEB.ACTIVITY_COUNT END) +o.count(*) as Totalįrom GMMI_AIR.WEB_ACTIVITY_FCT WEB join GMMI_AIR.SILVERPOP_CLICK C Sum(case when c.when_clicked is not null then c.count(*))as clickcount, SUM(case when o.WHEN_OPENED is not null then o.COUNT(*))as OPENCOUNT, -In this table they don’t have seprate field named ’Actitvity_count Decode: The DECODE function compares one expression to one or more other expressions and, when the base expression is equal to a search expression, it returns. SUM(DECODE(WEB.EVENT_TYPE,7,WEB.ACTIVITY_COUNT,0)) as DISCUSSIONVIEW, SUM(DECODE(WEB.EVENT_TYPE,6,WEB.ACTIVITY_COUNT,0)) AS DISCUSSIONSTART , SUM(DECODE(WEB.EVENT_TYPE,5,WEB.ACTIVITY_COUNT,0)) AS DISCUSSIONCOMMENT , I also like case statements as I have been using Sql server all the time, but in this job they use ORACLE and part of the query was already written, I had to add few more columns where I tried something like this! I am really confused as I can do sum of one activity in decode but how do I write statement where in one decode statement it's adding up more than one activity?Īnd also want to ask that if some event is coming from other table can I still use the joined fields from other tables in my decode statement? I am confused if I can do something like this? Most of the events are coming from one table, but in one column I have to show total of( open+view+print+register etc) and this all should come as one column as engagement _count along with other individual counts. SUM(DECODE(WEB.EVENT_TYPE,35,WEB.ACTIVITY_COUNT,0)) AS Cpn_Aprt It compares a given expression with each. SUM(DECODE(EVENT_TYPE,33,WEB.ACTIVITY_COUNT,0)) AS Cpnw SUM(DECODE(EVENT_TYPE,34,WEB.ACTIVITY_COUNT,0)) AS Cpn_Red , DECODE function in Standard Query Language (SQL) is used to add procedural IF THEN ELSE like statements to a query. SUM(DECODE(EVENT_TYPE,5,WEB.ACTIVITY_COUNT,0)) AS DISCUSSION, SUM(DECODE(EVENT_TYPE,2,WEB.ACTIVITY_COUNT,0)) AS BLOG I am trying to provide counts of different activities from one table, however few counts will come from other table and in the same query I also have to provide sum of 5 activities in one column.
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