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...
The simple CASE statement has the following structure: 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 ...
The SQL SELECT statement includes other appropriate clauses based on your entries in the FROM clause (table name), WHERE clause, and Other clauses fields in the SQL Clauses window. For example, you can specify values to complete the following tasks: Select the columns Name, Add...
PolledDataAvailableStatement指定适配器执行的 SQL 语句,以确定是否有任何数据可用于轮询。 仅当记录可用时,才会执行为PollingStatement绑定属性指定的 SELECT 语句。 默认值为SELECT 1 FROM DUAL,这意味着无论要轮询的表是否包含数据,适配器都必须继续轮询。
convert-sql-statement context指定架构名称。 destination指定输出是否应存储在文件中。 如果未指定此属性,则会在控制台上显示转换后的 T-SQL 语句。 (可选属性) conversion-report-folder指定可以用来存储评估报告的文件夹。(可选的属性) conversion-report-overwrite指定是否覆盖评估报告文件夹(如果已存在)。
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
SqlStatementConversionSample.xml VariableValueFileSample.xml ServersConnectionFileSample.xml 为了保持相关性而更改其中显示的参数之后,可以执行模板(文件)。 可以在“执行 SSMA 控制台 (OracleToSQL)”中找到 script-command 的完整列表 脚本文件验证 用户可以对照“Schemas”文件夹中提供的架构定义文件O2SSConsoleScript...
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-...
Format of Return Values: Examples You can use a format model to specify the format for Oracle to use to return values from the database to you. The following statement selects the salaries of the employees in Department 80 and uses theTO_CHARfunction to convert these salaries into character...