数据库问题
Are foreign keys indexed automatically in SQL Server?(外键是否在 SQL Server 中自动编入索引?)
How to drop unique in MySQL?(如何在 MySQL 中删除唯一性?)
mysql too many indexes?(mysql 索引太多?)
Sql server function for displaying word frequency in a column(用于在列中显示词频的sql server函数)
SQL Server UNIQUE constraint with duplicate NULLs(具有重复 NULL 的 SQL Server UNIQUE 约束)
MySQL: unique field needs to be an index?(MySQL:唯一字段需要是索引吗?)
SQL Server Clustered Index - Order of Index Question(SQL Server 聚集索引 - 索引顺序问题)
Indexing a MySql TEXT column?(索引 MySql TEXT 列?)
Does MySQL index NULL values?(MySQL 索引 NULL 值吗?)
Does Order of Fields of Multi-Column Index in MySQL Matter(MySQL中多列索引的字段顺序是否重要)
MySQL cannot create foreign key constraint(MySQL 无法创建外键约束)
How to properly index a linking table for many-to-many connection in MySQL?(如何在 MySQL 中为多对多连接正确索引链接表?)
