-> <sql id="qstart_sharding_table_case"> <sharding-table tables="sqltoy_trans_info_15d" strategy="realHisTable" params="beginDate" /> <value> <![CDATA[ select * from sqltoy_trans_info_15d t where t.trans_date>=:
字段2=值2 …… 字段n=值n where 条件表达式” (3) 删除数据记录: sql=“delete from 数据表 where 条件表达式” sql=“delete from 数据表” (将数据表所有记录删除) (4) 添加数据记录: sql=“insert into 数据表 (字段1,字段2,字段3 …) valuess (值1,值2,值3...
select userID, a_createdTime, first_value(a_createdTime) over(partition by userId order by a_createdTime ) first_time, datediff(a_createdTime, first_value(a_createdTime) over(partition by userId order by a_createdTime )) delta_time from ( select userID,date(from_unixtime(createdTime))...
单独设置 sql_mode 为STRICT_TRANS_TABLES会提示warning,NO_ZERO_DATE,NO_ZERO_IN_DATE,ERROR_FOR_DIVISION_BY_ZEROsql modes should be used with strict mode. They will be merged with strict mode in a future release. 建议和严格模式一起设置,这样数据才会更安全。 STRICT_ALL_TABLES 当第一个行数据非...
查询存储提示会替代其他硬编码语句级别提示和计划指南。 除了ABORT_QUERY_EXECUTION提示之外,带有查询存储提示的查询始终会执行。 对立的查询存储提示会被忽略,否则会导致错误。 如果查询存储提示相矛盾,SQL Server 不会阻止查询执行,也不会应用查询存储提示。 简单参数化 - 符合简单参数化条件的语句不支持查询存储提示。
介绍使用GaussDB(DWS)数据库命令行交互工具登录数据库后,gsql所提供的元命令。所谓元命令就是在gsql里输入的任何以不带引号的反斜杠开头的命令。 注意事项 一个gsql元命令的格式是反斜杠后面紧跟一个动词,然后是任意参数。参数命令动词和其他参数以任意个空白字符间隔。 要在参数里面包含空白,必须用单引号把它引起...
[DBA,ALL,USER]_INDEX_USAGE [DBA,ALL,USER]_INDEXES [DBA,ALL,USER]_OBJECTS [DBA,ALL,USER]_PART_INDEXES [DBA,ALL,USER]_PART_TABLES [DBA,ALL,USER]_PROCEDURES [DBA,ALL,USER]_SEGMENTS [DBA,ALL,USER]_SEQUENCES [DBA,ALL,USER]_SOURCE ...
Sometimes it’s necessary to find the maximum or minimum value from different columns in a table of the same data type. For example we have a table and three of its columns are of DATETIME type: UpdateByApp1Date, UpdateByApp2Date, UpdateByApp3Date. We want to retrieve data from the ...
Agenti system tables), we’ll need to find results where thextypecolumn (which specifies theobject typefor that row) is equal to the valueU, which stands for user table. The resultingTSQLstatement should look like this: 'U' Note: SinceSYSOBJECTSare part of theit is unnecessary to specify...
You can query the SYSOBJECTS view to find all of the tables in the database. This shows all objects, so to filter it to tables we can filter on the xtype column equals the value of "U", which represents a user table. Here's the query: ...