uid intNOTNULLCOMMENT'用户ID',exam_id intNOTNULLCOMMENT'试卷ID',start_time datetimeNOTNULLCOMMENT'开始时间',submit_time datetimeCOMMENT'提交时间',score tinyintCOMMENT'得分')CHARACTERSETutf8COLLATEutf8_general_ci;INSERTINTOexam_record(uid,exam_id,start_time,submit_time,score)VALUES(1006...
To finish up, let’s take a look at CASE functionality inside an UPDATE statement. The employees deserve a bonus in the form of extra vacation days. If you don’t have many left, you get 3 extra days. If you have between 10 and 20 hours left, you get 2 extra days, otherwise you ...
'2021.5.1'); insert into Users values('002' , '2021.5.1'); insert into Users values('00...
When searching between two date values on a tablepartitionedusing a date value, it is critical to leverage the partitioning scheme. This will minimize the amount of data to be scanned. One way to do this is to use a specific partition by eliminating unnecessary partitions, which involves ident...
VALUES DUMP OPTION VARYING ELSE OR VIEW END ORDER WAITFOR ERRLVL OUTER WHEN ESCAPE OVER WHERE EXCEPT PERCENT WHILE EXEC PIVOT WITH EXECUTE PLAN WRITETEXT 此外,ISO 标准定义了保留关键字列表。不要使用 ISO 保留关键字作为对象名和标识符。ODBC 保留关键字列表(如下表所示)与 ISO 保留关键字列表相同。
CASE is used to provide if-then-else type of logic to SQL. There are two formats: The first is a Simple CASE expression, where we compare an expression to static values. The second is a Searched CASE expression, where we compare an expression to one or more logical conditions. ...
当我想查询几条数据时,并且需要几条数据合并前为一条,可以使用该项(ps:我查询的是数字,没有验证其他是否有效,等想起来找一下书) select case when possibility between '10' and '30' then '10~30%' when possibility='50' then '50%' when possibility between '60' and '90' then '60~90%' when...
CASE expression the left hand side of the Boolean test appears right after the CASE word and is called the “input_expression”, and right hand sided of the Boolean test is right after word WHEN and is called the “when expression”. With the Simple CASE expression the operator between the...
This parameter has no functionality in a cluster with more than two instances. AQ_TM_PROCESSES Parameter type Integer Default value 0 Parameter class Dynamic: ALTER SYSTEM Range of values 0 to 10 AQ_TM_PROCESSES enables time monitoring of queue messages. The times can be used ...
--Create the partition scheme and function, align this to the number of CPU cores 1:1 up to 32 core computer -- so for below this is aligned to 16 core system CREATE PARTITION FUNCTION [pf_hash16] (tinyint) AS RANGE LEFT FOR VALUES (0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10,...