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...
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>insertintoemp1select*from emp;conventional传统方式数据 SQL> insert /*+ APPEND */ into emp1 select * from emp; 直接方式...
NOT IN、IS NOT NULL、NOT EXISTS,其中 NOT IN、NOT EXISTS 用于排除数据记录,应用在WHERE子句中较多;NOT EXISTS 也应用于创建数据库、数据表中使用较多...条件判断1 CASE表达式CASE表达式是一个比较常用的表达式工具,它允许在SQL语句中使用逻辑结构为 如果 ... 那么... 如果 ... 那么... 最后 的SQL语句。
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...
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...
WHEN condition_n THEN statements_n [ ELSE else_statements ] END CASE;] Code language: PostgreSQL SQL dialect and PL/pgSQL (pgsql) The searched CASE statement follows the rules below: The conditions in the WHEN clauses are evaluated in order, from top to bottom. The sequence of statements...
--1:任意执行一个update操作,用隐式游标sql的属性%found,%notfound,%rowcount,%isopen观察update语句的执行情况。 begin update empsetENAME='ALEARK'WHERE EMPNO=7469;ifsql%isopen then dbms_output.put_line('Openging');elsedbms_output.put_line('closing'); ...
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...
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Compare and create SQL Difference statement between 2 schemas Select objects to compare List of differences and SQL Code to be executed Run script output to SQL Worksheet to be executed against connection of choice 8. Process Commands Syntax Highlighting ...