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...
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...
DECODE is considered the most powerful function in Oracle. Oracle 8i release introduced the CASE expression. The CASE expression can do all that DECODE does plus lot of other things including IF-THEN analysis, use of any comparison operator and checking multiple conditions, all in a SQL query i...
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-if the function doesn't exist! To do this, ensure thesql_transpilerparameter ison(it'soffby default). When a function in thewhere...
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...
CASE selector WHEN selector_value_1 THEN statements_1 WHEN selector_value_1 THEN statement_2 ... ELSE else_statements END CASE; Code language: PostgreSQL SQL dialect and PL/pgSQL (pgsql) Let’s examine the syntax of the simple CASE statement in detail: 1) selector The selector is an...
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
使用join和case构造sql查询 sql oracle oracle11g 我一直坚持如何正确地构造查询。我需要有三个栏:姓名和姓氏,经理是否有保险费(真假),经理工作的部门。 SELECT CONCAT(CONCAT(FIRST_NAME, ' '), LAST_NAME) AS "Name And Surname", DEPARTMENTS.DEPARTMENT_NAME, COMMISSION_PCT LEFT JOIN HR.DEPARTMENTS ON ...
Oracle的CASE WHEN语法报ORA-00932错误 SELECT CASE WHEN dummy = 'x' THEN '-' ELSE 3 END FROM dual 1. 2. 3. 4. 5. 6. 上面SQL会报下面错误: ORA-00932: 数据类型不一致: 应为 CHAR, 但却获得 NUMBER 这是因为 THEN 后面是 CHAR 类型数据,而 ELSE 后面是 NUMBER 类型数据,数据类型不一致报错...
"Simple" SQL to check for alpha or numeric charcters isn't working right "String or binary data would be truncated.\r\nThe statement has been terminated." "String or binary data would be truncated" and field specifications “Unable to enlist in the transaction” with Oracle linked server fro...