3,mysql create view 不能有子查询 ( 视图 第1349号错误解决方法)ERROR 1349 (HY000): View's SELECT contains a subquery in the FROM clause 我的解决办法是 视图中包含视图 4,mysql CONCAT_WS和CONCAT的区别 首先看一下oracle当前的视图创建sql: create or replace view infoservice.mail_tasks as select ...
In Clause Special Extensions Outer Join Syntax Inner Join Outer Join-Quiz Correlated Sub Queries Subquery with Exists From Clause Query Advanced Queries Conclusion SQL Plus Environment Using Environment SQL Plus Query SQL Plus Text Editor Working Query Files SQL*Plus File location Setting Column Attrib...
The function can be used only in the WHERE clause of a query. It takes as an argument a condition and returns TRUE if the condition is FALSE or UNKNOWN and FALSE if the condition is TRUE. 语法– ```sql LNNVL( condition(s) ) ``` 示例– ```sql SELECT COUNT(*) FROM employees ...
1、SQL语句的DECODENVL()函数SELECTDECODE(WP01.ONDO_KBN,0 象外1,常温,2,保冷)ASONDO_KBNFROMWP01_S_HAITOTALWP01/分析:当 WP01.ONDO_KBN=0,将??象外赋值当 WP01.ONDO_KBN 时,将常温赋值当 WP01.ONDO_KBN=2,将保冷赋值NVL()函数:NVL(ARG,VALU 理标如果前面的 ARG为NULL 那么返回的值为后面的 ...
SQLCODE=-911, SQLSTATE=40001 解决方法: --- db2 命令行,1、用管理员用户登录:db2 connect to 你的数据库名 user 用户名 using 密码 2、db2 "get snapshot for locks on 数据库名" ---上面语句执行完成以后,你可以找到下面一段文字 应用程序句柄 = 689 应用程序标识 = *LOCAL.DB2.120711101108 序号...
3,mysql create view 不能有子查询 ( 视图 第1349号错误解决方法)ERROR 1349 (HY000): View's SELECT contains a subquery in the FROM clause 我的解决办法是 视图中包含视图 4,mysql CONCAT_WS和CONCAT的区别 首先看一下oracle当前的视图创建sql: ...
The following query uses theDECODE()function in theORDER BYclause to sort the employee’s result set based on an input argument: SELECTfirst_name, last_name, job_titleFROMemployeesORDERBYDECODE('J','F', first_name,'L', last_name,'J', job_title);Code language:SQL (Structured Query Lang...
CASE expression perform if-then-else logic in SQL without having to use PL/SQL. CASE works in a similar manner to DECODE(). CASE is ANSI-compliant. There are two types of CASE expressions: Simple case expressions use expressions to determine the returned value. ...
SQL LIMIT, TOP, FETCH: Controlling Result Sets SQL ORDER BY: Sorting Results (ASC/DESC, Multiple Columns) SQL WHERE Clause: Filtering Data with Precision SQL SELECT Statement: Retrieving Data Correctly Get a professional website today! Make a Website ...
Use of Having Clause and case in SQL MySql 3629 Views HAVING is very resemble WHERE. The only dissimilarity is that WHERE filters rows and HAVING filters groups. Increase in SQL HAVING clause because the WHERE keyword can not be used with the combination of functions. Syntax SELECT column_name...