The searchedCASEstatement has the following syntax: CASE WHEN e1 THEN r1 [ WHEN e2 THEN r2] ... [ELSE r_else]ENDCode language:SQL (Structured Query Language)(sql) The searchedCASEexpression evaluates the Boolean expression (e1, e2, …) in eachWHENclause in the order that the Boolean expr...
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...
Oracle Microsoft SQL DECLARE DECLARE VARIABLES ... BEGIN -- THIS IS REQUIRED SYNTAX PROGRAM_STATEMENTS ... IF ...THEN STATEMENT1; STATEMENT2; STATEMENTN; END IF; WHILE ... LOOP STATEMENT1; STATEMENT2; STATEMENTN; END LOOP; END; -- THIS IS REQUIRED SYNTAX DECLARE DECLARE VARIABLES ... ...
可以将 SELECT 语句指定为轮询语句,适配器会定期执行该语句来轮询 Oracle 数据库。 (可选)还可以指定在数据发生更改时适配器执行的轮询后 PL/SQL 代码块。 此块通常用于更新目标中查询记录上的字段,或将查询的记录移动到另一个表或视图。 若要启用此功能,必须在 Oracle 数据库适配器上指...
当出现"SQL statement ignored"错误时,通常是由于SQL语句中有语法错误或者逻辑错误导致Oracle无法正确解析SQL语句。要解决这个问题,需要检查SQL语句中的各个部分,确保语法正确,逻辑清晰,没有拼写错误或者其他错误。 以下是一些常见的导致"SQL statement ignored"错误的原因和解决方法: 检查SQL语句中的关键字和标点符号是否...
This tutorial provides an introduction to the Structured Query Language (SQL), learn how to create tables with primary keys, columns, constraints, indexes, and foreign keys. Tutorial SQL Macros - Creating parameterised views This tutorial explains how to create a parameterized view using SQL Macros...
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>conn scott/tiger Connected. 1. 2. 选择所有列 SQL>select*fromdept;DEPTNO DNAME LOC--- --- ---10ACCOUNTING NEW YORK20RESEARCH DALLAS30SALES CHICAGO40OPERATIONS BOSTON 1. 2. 3. 4. 5. 6. 7. 8. 选择指定列 SQL>selectdeptno,dnamefromdept;DEPTNO DNAME--- ---10ACCOUNTING20RESEARCH...
Using objects known as rollback segments, Oracle constructs read-consistent views of data as of the point in time a SQL statement is issued. A "snapshot too old" error might occur when rollback information is overwritten by other concurrent sessions. Prior to Oracle 9i, the recommended method...
The results of a SQL statement. The source uses an Oracle Connection Manager to connect to Oracle source. For more information, see Oracle Connection Manager. Error output Error output includes the following columns: Error Code: A number that represents error type of the current error. The error...