In this example, if the deptno column has a 10 in it, the SQL query will return the value accounting rather than the number 10. If the deptno is not 10, 20, 30, or 40, then the CASE statement will fall through to the ELSE clause, which will return unassigned. Note that with a s...
When the IF THEN statement has no ELSE clause and the condition is not met, PL/SQL does nothing instead raising an error. Simple CASE statement example The following example compares single value (c_grade) with many possible values ‘A’, ‘B’,’C’,’D’, and ‘F’: DECLARE c_...
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...
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...
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...
position or by keywords.An exampleofthe formercaseis 'sqlldr scott/tiger foo'; an example of the latter is 'sqlldr control=foo userid=scott/tiger'.One may specify parameters by position before but not after parameters specified by keywords.For example,'sqlldr scott/tiger control=foo logfile=lo...
There’s noifkeyword in SQL. If you want to doif-else-thenlogic inselect,whereor anywhere else in a statement, you need acaseexpression. This is a series ofwhenclauses that thedatabaseruns in order: For example, if you want to map exam correct percentages to grade letters according to...
java.sql.SQLException- if an error occurs See Also: defineColumnType(int,int),clearDefines getRowPrefetch intgetRowPrefetch() Retrieves the value or row prefetch for all result sets created from this statement. The row-prefetching feature associates an integer row-prefetch setting with a given sta...
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...
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。