简单Case函数和Case搜索函数。...如果使用Case函数,SQL代码如下: SELECT SUM(population), CASE country WHEN ‘中国’ THEN ‘亚洲’ WHEN ‘印度’ THEN ‘...但是那样增加消耗(两个Select部分),而且SQL语句会比较长。...三,在Check中使用Case函数。在Check中使用Case
CASE With Multiple Conditions It is also possible to stack multiple conditions inside a singleCASEclause. Syntax SELECTcolumn1, column2, ...CASEWHENcondition1THENresult1WHENcondition2THENresult2-- Add more WHEN conditions and results as neededENDASalias_nameFROMtable_name; We can add as manyWHEN...
那么你应该首先做一个使用分析变量的子查询：sum() over ()，它将显示每个字段的聚合数据，然后你可以...
在sql语句中使用if或case和multiple请注意，sql通常不考虑排序，因此结果可以按任何顺序返回，甚至可以使用...
CASE WHEN in SQL operates very similarly to “if then” statements in other programming languages. Replace the “if” with CASE WHEN and “else if” with WHEN, and the rest matches: Note: CASE WHEN statements will always output new values to a new column which is different than “if then...
<result> is an arbitrary SQL expression: it can be a simple expression like a constant or column name, or also a complex SQL expression containing subqueries and, of course, nested case expressions. A case expression can contain several when-then pairs. This allows for multiple conditions even...
SQL> SELECT v.expr.i1 2 , v.expr.i2 3 FROM ( SELECT CASE 4 WHEN 'x' = 'y' THEN INTEGER_PAIR_OT(0,1) 5 ELSE INTEGER_PAIR_OT(2,3) 6 END AS expr 7 FROM dual ) v; EXPR.I1 EXPR.I2 --- --- 2 3 1 row selected. Reply With Quote 07-04-2005, 05:18 ...
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SQL WITHData(value)AS(SELECT0UNIONALLSELECT1)SELECTCASEWHENMIN(value) <=0THEN0WHENMAX(1/value) >=100THEN1ENDFROMData; GO You should only depend on order of evaluation of the WHEN conditions for scalar expressions (including non-correlated subqueries that return scalars), not for aggregate exp...
In the tipSQL Server CASE Expression Overview, Aaron has written a section about data type precedence in the CASE expression. Nesting CASE Expressions With the searched CASE expression, we can have multiple WHEN conditions: SELECT [BusinessEntityID],[JobTitle],[HireDate],Seniority=CASE WHENDATEDIFF...