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 9i, you can use the CASE statement within a SQL statement. Syntax The syntax for ...
OracleCASEexpression allows you to addif-elselogic to SQL statements without having to call aprocedure. TheCASEexpression evaluates a list of conditions and returns one of the multiple possible results. You can use aCASEexpression in any statement or clause that accepts a valid expression. For e...
CASE expression syntax is similar to an IF-THEN-ELSE statement. Oracle checks each condition starting from the first condition (left to right). When a particular condition is satisfied (WHEN part) the expression returns the tagged value (THEN part). If none of the conditions are matched, the...
如何使用 Oracle Case Statement 测试不等式问题描述 投票:0回答:3这很好用: select case (1+2) -- (or_some_more_complicated_formula_yielding_a_numeric_result) when 200 then '200' when 100 then '100' else 'other' end hi_med_low from dual ; 但我需要做更多这样的事情: select case (1+...
This Oracle tutorial explains how to use the Oracle SELECT statement with syntax, examples, and practice exercises. The Oracle SELECT statement is used to retrieve records from one or more tables in an Oracle database.
After each stage of execution, the cursor retains enough information about the SQL statement to re-execute the statement without starting over, as long as no other SQL statement has been associated with that cursor. This is illustrated in Figure 7-1. Notice that the statement can be re-...
SQL语句编写规则 大小写不敏感。 语句可以占用一行或者多行。 关键字不能被省略,或者拆分成多行。 通常情况子句独占一行。 使用缩进增加语句的可读性。 在sqlplus或者其他工具中,每个语句结束需要加上一个分号。告诉客户端,你的语句结束了。 算术运算符
419 bytes received via SQL*Net from client 2 SQL*Net roundtrips to/from client 1 sorts (memory) 0 sorts (disk) 4 rows processed 2)反复执行第二种方法得到稳定的执行计划 sec@ora11g> select * from a full outer join b on a.a = b.a; ...
Throughout this book we try to provide examples illustrating both standards; however, our main focus is PL/SQL features rather than SQL. Try to answer the following questions, and then execute the script: What DBMS_OUTPUT.PUT_LINE statement is displayed if 15 students are enrolled in section ...
上述指定的報表詳細程度設定適用於 generate-assessment-report、convert-schema、migrate-data、convert-sql-statement 命令。 使用[錯誤報表] 設定,指出您在錯誤報表中所需的詳細資料範圍: 展開資料表 Sl. 不會。命令及參數輸出描述 1 report-errors="false" 沒有錯誤/警告/資訊訊息的詳細資料。 2 report-errors=...