今天写代码的时候,老是提示在You have an error in your SQL syntax; check the manual that corresponds to yourMySQLserver version for the right syntax to use near ‘describe。 写SQL语句的时候删掉这个字段就不会报错,加上这个字段添加和查询又会报错,纠结
unique_subquery is just an index lookup function that replaces the subquery completely for better efficiency. index_subquery This join type is similar to unique_subquery. It replaces IN subqueries, but it works for nonunique indexes in subqueries of the following form: value IN (SELECT key_colu...
-- 写一个函数将输入的字符串 重复n次 中间使用空格分开 create function charn(ch varchar(20),n int) returns varchar(255) begin declare result varchar(255); declare i INT; set result = ''; set i = 1; while i<=n do set result = concat(result,ch,' '); set i=i+1; end while; r...
工作时需要取得MySQL中一个表的字段是否存在 于是就使用Describe命令来判断 mysql_connect(localhost, root, root); mysql__db(demo); $test = mysql_query(Describe cdb_posts first); $test = mysql_fetch_array($test); $test[0]返回的是该字段的名称,比如我要查询first字段,返回的就是first 如果此字段不...
The describe function is for grouping related specs, typically each test file has one at the top level. The string pa... 查看原文 MOSFET enhances voltage regulator's overcurrent protection ;. Resistors R5 and R6 set IC1's output voltage, as the LM317's application notes describe. By ...
-- 1.2.查看所有对象DDL定义语句(表、视图、函数等)showcreatetablestudent;showcreateviewstudent_view;showcreatefunctionget_stu_name;showcreateproceduremy_procedure;showcreatedatabase test;showcreatetablespace***;showcreateuserroot; 2.测试 建表、视图、索引 ...
MySQL中的describe命令 describe命令一、describe命令用于查看特定表的详细设计信息,例如为了查看guestbook表的设计信息,可用: describe guestbook describe ol_user userid...show columns ”来查看数据库中表的列名,有两种使用方式: show columns form 表名 from 数据库名或者: show columns from 数据库名.表名三、...
This is correct for MySQL 4.1 and even the 5.0.1 alpha I used for month. But now, after upgrade to 5.0.15 I found out, that there is NO when NULL is not allowed. Does anyone know, when this change was implemented? Moreover it should be corrected in the manual. Thanks for comme...
Azure RBAC does not affect user permissions within the database. To create database users, you must sign in with admin credentials. Using a client tool such as MySQL Workbench, connect to your database server. To create a non-admin user, use the CREATE USER statement. Replace db_user ...
Bug #8073mysql command "describe" error Submitted:21 Jan 2005 16:42Modified:3 Feb 2005 15:38 Reporter:Gary JiangEmail Updates: Status:DuplicateImpact on me: None Category:MySQL ServerSeverity:S2 (Serious) Version:5.0.2-alpha-ntOS:Windows (windows xp) ...