The searched case statement is the much more powerful cousin of the simple case statement. The searched case statement is like an if…then…else structure, and can be used to conditionally search and replace values using logical operators and multiple conditions. Let's look at an example: SELEC...
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...
在OceanBase 数据库 V2.x/V3.x/V4.2.1 中,在纯 SELECT SQL 中不支持复杂类型(如 TYPE 类型)的使用, 即如果下面 function 返回值是复杂类型(如 TYPE 类型),则会报错。 SELECT fn_split('a,b,c',',') FROM dual; OceanBase 数据库 V4.2.x 新版本中已支持,如在 OceanBase 数据库 V4.2.4 版本中...
检查SQL语句中的函数和操作符是否正确使用,比如使用不支持的函数或者操作符。 检查SQL语句中的数据类型是否正确,比如在插入数据时数据类型不匹配。 使用SQL调试工具或者日志功能来定位错误的位置和原因。 通过以上方法逐一检查和调试SQL语句,可以帮助解决"SQL statement ignored"错误。如果仍然无法解决问题,可以尝试将问题的...
21-12-2022 10:37:44 CST Error executing statement: java.sql.SQLRecoverableException: Io exception: Connection reset java.sql.SQLRecoverableException: Io exception: Connection reset at oracle.jdbc.driver.SQLStateMapping.newSQLException(SQLStateMapping.java:101) at oracle.jdbc.driver.DatabaseError.new...
SQL Macros – Changing The Query Shape Using Parameters? Leave a reply One thing I learned early on when I was getting to know SQL macros is that we cannot replace each and every part of a SQL statement with a macro. In the same way, working with table SQL macros, we cannot represent...
where子句中的条件书写顺序,基本上对sql性能没有影响。 6 条件分支 6.1 Case子句 CASE有两种表达式: 1、 简单case表达式,使用表达式确定返回值。 语法: CASE SELECTOR WHEN EXPRESSION_1 THEN STATEMENT_1; WHEN EXPRESSION_2 THEN STATEMENT_2; ... WHEN EXPRESSION_N THEN STATEMENT_N; ELSE STATEMENT_N+1;...
OracleDatabase11g Enterprise EditionRelease11.2.0.3.0-64bit ProductionWiththe Partitioning,OLAP,DataMiningandRealApplication Testing optionsSQL>alteruserscott accountunlockidentifiedbytiger;Useraltered. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. ...
SQL Macros - Creating parameterised views This tutorial explains how to create a parameterized view using SQL Macros. The examples use the built-in sales history schema so there are no setup steps. Script Simple Explain Plan This script explains the plan for a query of the sh.sales and sh....
The format for a searchedcaseexpression is the syntax shown above: The core differences between this and simple expressions are: You can use multiple selectors The selectors are evaluated in everywhenclause the database runs Any SQL conditions that returntrueorfalseare possible in the<boolean condit...