The CASE statement can be used in the following versions of Oracle/PLSQL: Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i Example The CASE statement can be used in Oracle/PLSQL. You could use the CASE statement in a SQL statement as follows: (includes theexpressionclause) SELECT table_name...
1. CASE语句具有如下结构 CASE SELECTOR WHEN EXPRESSION 1 THEN STATEMENT 1; WHEN EXPRESSSION 2 THEN STATEMENT 2; ... WHEN EXPRESSION N THEN STATEMENT N; ELSE STATEMENT N+1; END CASE; 保留字CASE标识CASE语句的开始。选择器决定哪个WHEN子句应该被执行。每个WHEN子句都包含一个EXPRESSION以及与之关联的...
The coalesce statement is a bit like the Oracle NVL function. Given an unlimited number of arguments, it will return the first non-null value in those arguments. Here is an example: SELECT ename, COALESCE(comm, 0) COMM FROM emp; ENAME COMM --- --- SMITH 0 ALLEN 300 WARD 500 JONES ...
子句 说明 是否必须使用 SELECT 要返回的列或者表达式 是 FROM
简单Case函数的写法相对比较简洁，但是和Case搜索函数相比，功能方面会有些限制，比如写判断式。 还有...
SELECT a.c_tenantid, a.c_tacode, c_tradeacco, CASE CONCAT(CONCAT(CONCAT('F6' ,a.c_agencyno),c_taflag),a.c_businflag) WHEN '66003153' THEN ' ' ELSE c_cityno END c_cityno, a.c_fundcode, a.d_requestdate, d_requesttime, a.c_businflag, ...
There’s noifkeyword in SQL. If you want to doif-else-thenlogic inselect,whereor anywhere else in a statement, you need acaseexpression. This is a series ofwhenclauses that thedatabaseruns in order: For example, if you want to map exam correct percentages to grade letters according...
B) Using CASE expression in a HAVING clause# Consider the followingorder_itemsandproductstables: In the following query, we use theCASEexpression in aHAVINGclause to restrict rows returned by theSELECTstatement. SELECTproduct_name, category_id,COUNT(product_id)FROMorder_itemsINNERJOINproductsUSING(pr...
1ORACLE中的CASE……WHEN这两种写法查询结果不一样,请问区别在哪里?A:select sum(case when a.city_id in (47,45,35,37,36) then1 else 0 end) 甘肃北部,sum(case when a.city_id in (34,33,32) then1 else 0 end) 甘肃东部,sum(case when a.city_id in (39,38,41) then1 else 0 end)...
We ensure these details do not get added again by looking at the indicator in the functional detail table. If the function is not being called from MAKE_CREATE: Select any details on the ALLOC_MFQUEUE that are for the same Business transaction and for the same message type. Create Oracle ...