This Oracle tutorial explains how to use the Oracle/PLSQLCASE statementwith syntax and examples. Description The Oracle/PLSQL CASE statement has the functionality of an IF-THEN-ELSE statement. Starting in Oracle
If you need to use this logic in many tables you could place it in a PL/SQL function. Then call this function in your SQL: FromOracle Database 23ai, theautomatic SQL transpilercan extract SQL expressions in PL/SQL. These are then part of the SQL statement, so at runtime it's as-i...
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...
oracle.javatools.db.sql Contains an API for declaratively parsing SQL queries (SELECT statements). Uses ofCaseStatement.WhenTheninoracle.javatools.db.sql Methods inoracle.javatools.db.sqlthat returnCaseStatement.WhenThen Modifier and TypeMethod and Description ...
and checking multiple conditions, all in a SQL query itself. Moreover, using the CASE function, multiple conditions provided in separate SQL queries can be combined into one, thus avoiding multiple statements on the same table (example given below). The function is available from Oracle 8i ...
Oracle SQL中的Case语句是一种条件表达式,用于根据不同的条件执行不同的操作。它可以在SELECT、UPDATE和DELETE语句中使用。 Case语句有两种形式:简单Case表达式和搜索Case表达式。 简单Case表达式:简单Case表达式用于将一个表达式与一系列可能的值进行比较,并在匹配时执行相应的操作。它的语法如下: 代码语言:txt 复制 CA...
注意:集合操作的所有查询返回的列数、列类型必须相同,但是列名可以不一样。 2、translate 函数 translate(x, str1, str2) . 在字段x 中查找str1中的字符,转化为str2中对应的字符。 例子: select translate(x, 'abc', 'xyz') from table1 对字段x中字符进行替换:a->x, b->y, x->z ...
select sum(case when a.XX = '北京' then '1' else null end)from table a;补充'1' 这里可以是 1 或者'1'，但要求必须是数字才可以 。 否则就是无效的数字 字段
Oracle SQL 函数使用记录 nvl(列名,替换值) NVL(column_name,0) 用来判断字段的值是否为null,如果查询的字段值为null,则将其用其他字符代替,效果如下 listagg(要合并的列名,分隔符) within group(order by 排序列名 ASC/DESC ) LISTAGG(ENAME, ‘,’) WITHIN GROUP (O... 查看原文 listagg ,分组拼接字段 ...
Oracle SQL CASE WHEN ORA-00932：不一致的数据类型：预期的CHAR得到了编号00932.00000-“不一致的数据...