二、“order by”引发的乱序 经过一番排查,发现罪魁祸首其实是order by。当使用order by的字段存在多行相同值时,就会导致上面出现的乱序问题,这里我们来看下官方的解释[1]: ❝If multiple rows have identical values in theORDER BYcolumns, the server is free to return those rows in any order, ...
这种行为的一种表现是带有和不带有 LIMIT 的 ORDER BY 查询可能会以不同的顺序返回行,如本节后面所述。 原文: If multiple rows have identical values in the ORDER BY columns, the server is free to return those rows in any order, and may do so differently depending on the overall execution plan...
If multiple rows have identical values in theORDER BYcolumns, the server is free to return those rows in any order, and may do so differently depending on the overall execution plan. In other words, the sort order of those rows is nondeterministic with respect to the nonordered columns. 上...
所以我们可以确定这个SQL执行时是会找到limit要求的行后立马返回查询结果的。 不过就算它立马返回,为什么分页会不准呢? 官方文档里面做了如下说明: If multiple rows have identical values in the ORDER BY columns, the server is free to return those rows in any order, and may do so differently depending ...
The SQL ORDER BY clause allows you to order your results. You can specify what you want to order by, and can even order by multiple columns. By default, the SQL results are not ordered in any specific order. Without the ORDER BY clause in your SQL query, the results may look like th...
只使用order by, 不使用limit时候,查询的语句: SELECT * FROM test ORDER BY score ASC 1. 2. 查询结果: 下面我们按照 score 升序,每页3条数据,来获取数据。 下面的sql依次为第1页、第2页、第3页、第4页、第5页的数据,如下: 查询第1页的语句: ...
In TypeORM, you can order your results by multiple columns. The 2 examples below show you how to do that. The first example uses the find() method whilst the second one uses a query builder. In both of these examples, we will work with...
Bug description When using queryRaw and MySQL, ordering by multiple columns from variables causes the query to never complete, the next line is never executed. Other queries can still be issued. Nothing is logged. The same issue occurs w...
If multiple rows have identical values in theORDER BYcolumns, the server is free to return those rows in any order, and may do so differently depending on the overall execution plan. In other words, the sort order of those rows is nondeterministic with respect to the nonordered columns. ...
If multiple rows have identical values in the ORDER BY columns, the server is free to return those rows in any order, and may do so differently depending on the overall execution plan. In other words, the sort order of those rows is nondeterministic with respect to the nonordered columns....