SQL>show userUSER为"HR"SQL>SELECTfirst_name,last_name,department_id,2CASEdepartment_id3WHEN10THEN'Accounting'4WHEN20THEN'Sales'5WHEN30THEN'Finance'6ELSE'Other'7ENDdepartment_name8FROMemployees where rownum<2;FIRST_NAMELAST_NAMEDEPARTMENT_IDDEPARTMENT_NAME---Steven King90OtherSQL> ※测试使用的Orac...
在Oracle SQL中,CASE表达式是一种条件表达式,用于根据不同的条件返回不同的结果。它可以在SELECT语句、WHERE子句、ORDER BY子句和其他SQL语句中使用。 CASE表达式有两种形式:简单CASE表达式和搜索CASE表达式。 简单CASE表达式: 简单CASE表达式使用固定的值进行比较,并根据每个值返回不同的结果。它的语法如下: ...
12 rows selected 与case when 配合: select case when grouping(e.department_id)=0 then ''||e.department_id else 'All Departments' end as department_id , case when grouping(e.job_id)=0 then e.job_id else 'All Jobs' end as job_id, avg(e.salary) from hr.employees e where e.depart...
In this example, if the deptno column has a 10 in it, the SQL query will return the value accounting rather than the number 10. If the deptno is not 10, 20, 30, or 40, then the CASE statement will fall through to the ELSE clause, which will return unassigned. Note that with a s...
oraclesql中的Case函数 sql oracle case 我有一个基本问题,当你的用例有多个值时,我可以使用OR,但我总是要重复列的名称=或者有一个更简单的解决方案,请参阅下面的电话号码示例。谢谢你的建议。 -- Channel Dial CASE WHEN FIS.TARGET_ADDRESS = '+3222011111' OR FIS.TARGET_ADDRESS = '+3222018181' THEN ...
6) 分析出来的内容查询 v$logmnr_content --sqlredo/sqlundo ### managing indexes ### /*create index*/ example: /*创建一般索引*/ create index index_name on table_name(column_name) tablespace tablespace_name; /*创建位图索引*/ create bitmap index...
CASE表达式可以再SQL中实现if-then-else型的逻辑,9i及以上版本支持CASE表达式。 1. 使用简单CASE表达式 语法如下: CASE search_expression WHENexpression1 THEN result1 … ELSEdefault_result END store@PDB1> select product_id,product_type_id,caseproduct_type_id ...
SELECT*FROMlocationsWHEREcountry_idin('US','CA','UK')ORDERBYcountry_id,CASEcountry_idWHEN'US'THENstateELSEcityEND;Code language:SQL (Structured Query Language)(sql) In this example, the result set is sorted by the column state when the country is theUSand by the column city for all othe...
For example, let’s extend the exam result to grade logic to also return: A* if the result is 100% U if the percentage is null or zero You can use a case expression like this: This enhancement is currently only in PL/SQL.
tCASE ttWHEN a < 3 THEN '小于3' ttELSE '大于等于3' tEND as b FROM t1; 也可以更加具体的比如: SELECT tCASE ttWHEN a = 1 THEN '等于1' ttWHEN a = 2 THEN '等于2' ttWHEN a > 2 THEN '大于2' tEND as b FROM t1; 总之,Case When是一种非常灵活的SQL语句,可以根据用户自定义的布尔...