; 15 / x = TRUE NOT x = FALSE x = FALSE NOT x = TRUE x = NULL NOT x = NULL PL/SQL procedure successfully completed. SQL> Related Topic PL/SQL Logical Operators Using AND operator Using OR operator NULL Value in Unequal Comparison NULL Value in Equal Comparison NOT NULL Equals NULL...
4. 对比 Oracle 执行计划 Tips:当 OB 上看到的执行计划不符合预期,但又找不到原因时,可以对比 Oracle 的执行计划。 Oracle 上执行计划如下(这里得用set autotrace on的方式查看真实执行计划): 可以使用 HASH ANTI JOIN,并且有个重要信息HASH JOIN RIGHT ANTI NA(EXPLAIN 是看不到 NA 的), 直接搜索就可以得到...
Data.OracleClient 程序集: System.Data.OracleClient.dll 对OracleBoolean 执行NOT 运算。 C# 复制 public static System.Data.OracleClient.OracleBoolean operator ! (System.Data.OracleClient.OracleBoolean x); 参数 x OracleBoolean 要对其执行“非”运算的 OracleBoolean。 返回 OracleBoolean 一个Oracle...
To perform this operation, the operand needs to be explicitly cast with a cast operator. C# 複製 public const int DTS_E_EXPREVALSTATIC_BINARYOPDTSTRNOTSUPPORTED = -1073442605; Field Value Value = -1073442605 Int32 Applies to 產品版本 SQL Server .NET SDK 2016, 201...
The OR operator returns true if the other operand returns true; otherwise it returns NULL. The NOT operator returns NULL. Example 6-61 Fetch the id, first name, last name, and age for users who are not in the age group of 20 to 40 or whose income is greater than 90K ...
NLS_LANG specifies a character set that is NOT the default character set for Oracle clients on IBM z/os (WE8EBCDIC1047). This problem has only been reported in relation to the use of Oracle clients on IBM z/os.SymptomsError 'ORA-00996: the concatenate operator is ||, not |' occurs ...
Next: <and> Boolean Operator <not> Boolean OperatorThis Boolean operator negates the result of another Boolean operator. This operator has no attributes and has a single child element, which is one of the other Boolean operators. This operator evaluates to true only if the value of its contai...
前段时间碰到一个慢 SQL,NOT IN 子查询被优化器改写成了 NESTED-LOOP ANTI JOIN,但是被驱动表全表扫描无法使用索引,执行耗时 16 秒。SQL 如下: SELECT AGENT_ID, MAX(REL_AGENT_ID) FROM T_LDIM_AGENT_UPREL WHERE AGENT_ID NOT IN (select AGENT_ID ...
NOT IN 和 <>ALL 对 NULL 值敏感,这意味着 NOT IN 后面的子查询或者常量集合一旦有 NULL 值出现,则整个 SQL 的执行结果就会为 NULL。 所以一旦相关的连接列上出现了 NULL 值(实际只会判断字段是否有 NOT NULL 约束),此时 Oracle 如果还按照通常的 ANTI JOIN 的处理逻辑来处理(实际和 INNER JOIN 的处理逻...
LOBs stored in the database will eventually be read (and potentially updated) by an application. But LOBs aren't always equal. How large is large? With Oracle, when you have more than 32k bytes, you can no longer store the data in a VARCHAR2. But is 32k plus one byte large...