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_...
上述执行计划是在执行目标SQL (select/++real_exp_examplel */tl.coll,tl.c012,t2.c013 from tl,t2 where tl.c012=t2.c012)后使用DBMS_XPLAN包中的方法DISPLAY_CURSOR得到的,这是目标SQL的真实执行计划。 从显示结果中我们可以看到,上述SQL的执行计划可以分为如下三个部分。 1.目标SQL的正文、SQL_ID和...
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...
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...
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。
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...
这里显示的是失败的SQL 代码语言:javascript 代码运行次数:0 运行 AI代码解释 dbkedDefDump():Starting a non-incident diagnosticdump(flags=0x0,level=3,mask=0x0)---Error Stack Dump---CurrentSQLStatementforthissession(sql_id=0wjycn5zghkkh)---select*from err 4.3 Call Stack 这里...
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.products tables. Both statements must be ...