通过上面的两条 SQL 我们可以发现,当 SQL 语句两次调用now()函数时,前后两次now()函数返回的是相同的时间,而当 SQL 语句两次调用sysdate()函数时,前后两次sysdate()函数返回的时间在更新。 到这里我们根据官方文档的说明加上自己的推测大概可以知道,函数sysdate()之所以不能使用索引是因为sysdate()的不确定性导致...
Difference between char s[] and char *s in C What is the difference between SQL and MySQL? What is the difference between MySQL NOW() and SYSDATE()? What is the difference between int and integer in MySQL? What is the difference between BIT and TINYINT in MySQL? In MySQL, what is ...
Except the above statement, there is no difference between AND and &&. Let us look at all the conditions. The result of AND and && will always be either 1 or 0. As we know the AND and && both are logical operators, if there are more than one operand and any one of them has valu...
Sql - Difference between two dates in MySQL, This function takes the difference between two dates and shows it in a date format yyyy-mm-dd. All you need is to execute the code below and then use the function. After executing you can use it like this SELECT datedifference (date1, date...
Difference Between CouchDB and MySQL CriteriaCouchDBMySQL Database Type NoSQL (Document-Oriented) SQL (Relational) Data Structure JSON-like documents Tables with rows and columns Schema Requirement Schema-less Requires defined schema Query Language JavaScript-based map/reduce queries (Mango) SQL Transact...