The CASE statement can be used in the following versions of Oracle/PLSQL: Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i Example The CASE statement can be used in Oracle/PLSQL. You could use the CASE statement in a SQL statement as follows: (includes theexpressionclause) SELECT table_name...
SQL> create table emp1 as select * from emp where 1=2; SQL> insert into emp1 select * from emp; 传统方式数据 SQL> insert /*+ APPEND */ into emp1 select * from emp; 直接方式数据,必须commit后才能查看数据 【实验】直接路径插入数据 SQL>createtableemp1asselect*fromempwhere1=2; SQL>ins...
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...
当SQL%FOUND为TRUE时,SQL%NOTFOUND为FALSE。 SQL%ROWCOUNT 在执行任何DML语句之前,SQL%ROWCOUNT的值都是NULL,对于SELECT INTO语句,如果执行成功 ,SQL%ROWCOUNT的值为1,如果没有成功,SQL%ROWCOUNT的值为0,同时产生一个异常NO_DATA_FOUND. SQL%ISOPEN SQL%ISOPEN是一个布尔值,如果游标打开,则为TRUE, 如果游标关闭,...
mysql case用法 在sql 进行分支处理 问题: 如果分开查询,会导致排序的话会很麻烦,所以还是希望在sql 语句中处理。 解决:使用 sql 中的 case 来解决。...SELECT a.id as orderId, case a.platform when 0 then b.name when 1 then c.name end as name,...case a.platform when 0 then b.title when...
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...
Both types of CASE statements support an optional ELSE clause. Simple PL/SQL CASE statement A simple CASE statement evaluates a single expression and compares the result with some values. The simple CASE statement has the following structure: CASE selector WHEN selector_value_1 THEN statements_1...
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...
(1)If CURSOR_SPACE_FOR_TIMEis set to false (the default), then a cursor can be deallocatedfromthe library cache regardless ofwhether application cursors associated with its SQL statement are this case, Oracle Database must verify that the cursor containing the SQLstatement is in the library ca...
This Oracle tutorial explains how to use the Oracle WHERE clause with syntax and examples.Description The Oracle WHERE clause is used to filter the results from a SELECT, INSERT, UPDATE, or DELETE statement.Syntax The syntax for the WHERE clause in Oracle/PLSQL is: WHERE conditions; Parameters...