uTools-Manuals/index/sql.json

[{"name":"ALIASES","type":"","path":"sql/ALIASES.html","desc":"通过使用 SQL，可以为表名称或列名称指定别名（Alias）"},{"name":"ALTER TABLE","type":"语句","path":"sql/ALTER TABLE 语句.html","desc":"ALTER TABLE 语句用于在已有的表中添加、删除或修改列"},{"name":"AND & OR","type":"运算符","path":"sql/AND & OR 运算符.html","desc":"AND & OR 运算符用于基于一个以上的条件对记录进行过滤"},{"name":"AUTO INCREMENT","type":"字段","path":"sql/AUTO INCREMENT 字段.html","desc":"Auto-increment 会在新记录插入表中时生成一个唯一的数字"},{"name":"AVG()","type":"函数","path":"sql/AVG() 函数.html","desc":"AVG() 函数返回数值列的平均值"},{"name":"BETWEEN","type":"操作符","path":"sql/BETWEEN 操作符.html","desc":"BETWEEN 操作符用于选取介于两个值之间的数据范围内的值"},{"name":"CHECK","type":"约束","path":"sql/CHECK 约束.html","desc":"CHECK 约束用于限制列中的值的范围"},{"name":"COUNT()","type":"函数","path":"sql/COUNT() 函数.html","desc":"COUNT() 函数返回匹配指定条件的行数"},{"name":"CREATE DATABASE","type":"语句","path":"sql/CREATE DATABASE 语句.html","desc":"CREATE DATABASE 语句用于创建数据库"},{"name":"CREATE INDEX","type":"语句","path":"sql/CREATE INDEX 语句.html","desc":"CREATE INDEX 语句用于在表中创建索引"},{"name":"CREATE TABLE","type":"语句","path":"sql/CREATE TABLE 语句.html","desc":"CREATE TABLE 语句用于创建数据库中的表"},{"name":"Date","type":"函数","path":"sql/Date 函数.html","desc":"当我们处理日期时，最难的任务恐怕是确保所插入的日期的格式，与数据库中日期列的格式相匹配"},{"name":"DEFAULT","type":"约束","path":"sql/DEFAULT 约束.html","desc":"DEFAULT 约束用于向列中插入默认值"},{"name":"DELETE","type":"语句","path":"sql/DELETE 语句.html","desc":"DELETE 语句用于删除表中的记录"},{"name":"DROP TRUNCATE","type":"语句","path":"sql/DROP TRUNCATE 语句.html","desc":"通过使用 DROP 语句，可以轻松地删除索引、表和数据库"},{"name":"FIRST()","type":"函数","path":"sql/FIRST() 函数.html","desc":"FIRST() 函数返回指定的列中第一个记录的值"},{"name":"FOREIGN KEY","type":"约束","path":"sql/FOREIGN KEY 约束.html","desc":"一个表中的 FOREIGN KEY 指向另一个表中的 PRIMARY KEY"},{"name":"FORMAT()","type":"函数","path":"sql/FORMAT() 函数.html","desc":"FORMAT() 函数用于对字段的显示进行格式化"},{"name":"FULL OUTER JOIN","type":"关键字","path":"sql/FULL OUTER JOIN 关键字.html","desc":"FULL OUTER JOIN 关键字只要左表（table1）和右表（table2）其中一个表中存在匹配，则返回行."},{"name":"GROUP BY","type":"语句","path":"sql/GROUP BY 语句.html","desc":"Aggregate 函数常常需要添加 GROUP BY 语句"},{"name":"HAVING","type":"子句","path":"sql/HAVING 子句.html","desc":"在 SQL 中增加 HAVING 子句原因是，WHERE 关键字无法与 Aggregate 函数一起使用"},{"name":"IN","type":"操作符","path":"sql/IN 操作符.html","desc":"IN 操作符允许您在 WHERE 子句中规定多个值"},{"name":"INNER JOIN","type":"关键字","path":"sql/INNER JOIN 关键字.html","desc":"INNER JOIN 关键字在表中存在至少一个匹配时返回行"},{"name":"INSERT INTO SELECT","type":"语句","path":"sql/INSERT INTO SELECT 语句.html","desc":"通过 SQL，您可以从一个表复制信息到另一个表"},{"name":"INSERT INTO","type":"语句","path":"sql/INSERT INTO 语句.html","desc":"INSERT INTO 语句用于向表中插入新记录"},{"name":"LAST()","type":"函数","path":"sql/LAST() 函数.html","desc":"LAST() 函数返回指定的列中最后一个记录的值"},{"name":"LCASE()","type":"函数","path":"sql/LCASE() 函数.html","desc":"LCASE() 函数把字段的值转换为小写"},{"name":"LEFT JOIN","type":"关键字","path":"sql/LEFT JOIN 关键字.html","desc":"LEFT JOIN 关键字从左表（table1）返回所有的行，即使右表（table2）中没有匹配"},{"name":"LEN()","type":"函数","path":"sql/LEN() 函数.html","desc":"LEN() 函数返回文本字段中值的长度"},{"name":"LIKE","type":"操作符","path":"sql/LIKE 操作符.html","desc":"LIKE 操作符用于在 WHERE 子句中搜索列中的指定模式"},{"name":"MAX()","type":"函数","path":"sql/MAX() 函数.html","desc":"MAX() 函数返回指定列的最大值"},{"name":"MID()","type":"函数","path":"sql/MID() 函数.html","desc":"MID() 函数用于从文本字段中提取字符"},{"name":"MIN()","type":"函数","path":"sql/MIN() 函数.html","desc":"MIN() 函数返回指定列的最小值"},{"name":"MySQL CURDATE()","type":"函数","path":"sql/MySQL CURDATE() 函数.html","desc":"CURDATE() 返回当前的日期"},{"name":"MySQL CURTIME()","type":"函数","path":"sql/MySQL CURTIME() 函数.html","desc":"CURTIME() 返回当前的时间"},{"name":"MySQL DATE ADD()","type":"函数","path":"sql/MySQL DATE ADD() 函数.html","desc":"DATE_ADD() 函数向日期添加指定的时间间隔"},{"name":"MySQL DATE FORMAT()","type":"函数","path":"sql/MySQL DATE FORMAT() 函数.html","desc":"DATE_FORMAT() 函数用于以不同的格式显示日期/时间数据"},{"name":"MySQL DATE SUB()","type":"函数","path":"sql/MySQL DATE SUB() 函数.html","desc":"DATE_SUB() 函数从日期减去指定的时间间隔"},{"name":"MySQL DATE()","type":"函数","path":"sql/MySQL DATE() 函数.html","desc":"DATE() 函数提取日期或日期/时间表达式的日期部分"},{"name":"MySQL DATEDIFF()","type":"函数","path":"sql/MySQL DATEDIFF() 函数.html","desc":"DATEDIFF() 函数返回两个日期之间的天数"},{"name":"MySQL EXTRACT()","type":"函数","path":"sql/MySQL EXTRACT() 函数.html","desc":"EXTRACT() 函数用于返回日期/时间的单独部分，比如年、月、日、小时、分钟等等"},{"name":"MySQL NOW()","type":"函数","path":"sql/MySQL NOW() 函数.html","desc":"NOW() 返回当前的日期和时间"},{"name":"NOT NULL","type":"约束","path":"sql/NOT NULL 约束.html","desc":"在默认的情况下，表的列接受 NULL 值"},{"name":"NOW()","type":"函数","path":"sql/NOW() 函数.html","desc":"NOW() 函数返回当前系统的日期和时间"},{"name":"NULL","type":"函数","path":"sql/NULL 函数.html","desc":"ISNULL()、NVL()、IFNULL() 和 COALESCE() 函数"},{"name":"ORDER BY","type":"关键字","path":"sql/ORDER BY 关键字.html","desc":"ORDER BY 关键字用于对结果集进行排序"},{"name":"PRIMARY KEY","type":"约束","path":"sql/PRIMARY KEY 约束.html","desc":"PRIMARY KEY 约束唯一标识数据库表中的每条记录"},{"name":"RIGHT JOIN","type":"关键字","path":"sql/RIGHT JOIN 关键字.html","desc":"RIGHT JOIN 关键字从右表（table2）返回所有的行，即使左表（table1）中没有匹配"},{"name":"ROUND()","type":"函数","path":"sql/ROUND() 函数.html","desc":"ROUND() 函数用于把数值字段舍入为指定的小数位数"},{"name":"SELECT DISTINCT","type":"语句","path":"sql/SELECT DISTINCT 语句.html","desc":"SELECT DISTINCT 语句用于返回唯一不同的值"},{"name":"SELECT INTO","type":"语句","path":"sql/SELECT INTO 语句.html","desc":"通过 SQL，您可以从一个表复制信息到另一个表"},{"name":"SELECT TOP","type":"子句","path":"sql/SELECT TOP 子句.html","desc":"SELECT TOP 子句用于规定要返回的记录的数目"},{"name":"SELECT","type":"语句","path":"sql/SELECT 语句.html","desc":"SELECT 语句用于从数据库中选取数据"},{"name":"SQL Server CONVERT()","type":"函数","path":"sql/SQL Server CONVERT() 函数.html","desc":"CONVERT() 函数是把日期转换为新数据类型的通用函数"},{"name":"SQL Server DATEADD()","type":"函数","path":"sql/SQL Server DATEADD() 函数.html","desc":"DATEADD() 函数在日期中添加或减去指定的时间间隔"},{"name":"SQL Server DATEDIFF()","type":"函数","path":"sql/SQL Server DATEDIFF() 函数.html","desc":"DATEDIFF() 函数返回两个日期之间的天数"},{"name":"SQL Server DATEPART()","type":"函数","path":"sql/SQL Server DATEPART() 函数.html","desc":"DATEPART() 函数用于返回日期/时间的单独部分，比如年、月、日、小时、分钟等等"},{"name":"SQL Server GETDATE()","type":"函数","path":"sql/SQL Server GETDATE() 函数.html","desc":"GETDATE() 函数从 SQL Server 返回当前的日期和时间"},{"name":"SUM()","type":"函数","path":"sql/SUM() 函数.html","desc":"SUM() 函数返回数值列的总数"},{"name":"UCASE()","type":"函数","path":"sql/UCASE() 函数.html","desc":"UCASE() 函数把字段的值转换为大写"},{"name":"UNION","type":"操作符","path":"sql/UNION 操作符.html","desc":"SQL UNION 操作符合并两个或多个 SELECT 语句的结果"},{"name":"UNIQUE","type":"约束","path":"sql/UNIQUE 约束.html","desc":"UNIQUE 约束唯一标识数据库表中的每条记录"},{"name":"UPDATE","type":"语句","path":"sql/UPDATE 语句.html","desc":"UPDATE 语句用于更新表中的记录"},{"name":"VIEWS","type":"","path":"sql/VIEWS.html","desc":"视图是可视化的表"},{"name":"WHERE","type":"子句","path":"sql/WHERE 子句.html","desc":"WHERE 子句用于过滤记录"},{"name":"通配符","type":"","path":"sql/通配符.html","desc":"通配符可用于替代字符串中的任何其他字符"}]