在SQL语句中使用IF或CASE with multiple条件的作用是根据不同的条件执行不同的操作或返回不同的结果。这些条件可以是基于列的值、函数的结果、逻辑表达式等。 使用IF语句可以根据条件执行不同的操作。IF语句的基本语法如下: 代码语言:txt 复制 IF condition THEN statement1; ELSE statement2; END IF; 其中,conditio...
A week this year Against a week this time last year in SQL (NOT MDX) A WITH keyword and parenthesis are now required Accent Sensitivity Access Code - DELETE Statement with DISTINCTROW and T-SQL Access Now() vs. T-SQL GETDATE() ? ADD and SUBTRACT depending on the condition is CASE STAT...
8.Which of the following is one of the basic types of joins in Oracle DB ?Outer join Self-join Equi-join All of the aboveAnswer: C. Equi-join and non-equijoin are the two basic types of joins in Oracle DB.9.What is the main condition for using joins between a source table and ...
To change the check on empty string the formula could be =IF(ISNA(XMATCH("",AF3:AI3)), "Yes", "N/A") In attached file I changed K3 to test. To change the check on empty string the formula could be SergeiBaklan That works perfect, thank you very much! Have a good weekend. El...
Yes, two indexes may be used when 1st WHERE condition is covered by Index1 and 2nd WHERE condition is covered by Index2. In this case SQL may decide to use Index Seek for both indexes and then do Hash Match (Inner Join). prettyprint 複製 select * from [dbo].[Table] where Rev...
Note that submitting a single SELECT or DML statement to the server is simply a single statement batch, a special case of the first type of the request. In either case, SQL Server iterates over the statements contained in the batch or stored procedure and sequentially executes them. ...
Is this then a bug in Oracle 12c?[22 Nov 2017 11:26] MySQL Verification Team Thank you for the feedback. The Oracle's result is the same as MySQL just happens that Oracles uses an empty result instead of NULL, on another hand I commented SQL Server behaves as MySQL on this case ...
Perhaps other variant exist, but in any case for flexible number of columns on which make the selection that will be bit more complex than nested if ... then ... else
I would first execute query that filters data (and return only Ids of records matching condition), and then use that resulting enumerable object with record Ids in:.Where(p => ids.Contains(p.Id)). In my scenario, query that filters data is always translated to single SQL query/statement....
I need to put multiple values in "IN ()" condition. I can use more parameters, e.g. "IN (?,?,?)", but in this case I need also to generate SQL query: values = ['a', 'b', 'c'] sql = [] for value in values sql.push '?' db.query " delete from characteristic where ...