在SQL中,可以使用CASE语句来根据条件选择要更新的列。CASE语句是一种条件表达式,它允许根据不同的条件执行不同的操作。 在选择要更新的列时,可以使用CASE语句来根据条件选择不同的列进行更新。以下是一个示例: 代码语言:sql 复制 UPDATE table_name SET column_name = CASE WHEN condition1 THEN value1 WHEN cond...
We can add as manyWHEN ... THENconditions as required in theCASEstatement. For example, -- multiple CASE conditions in SQLSELECTcustomer_id, first_name,CASEWHENcountry ='USA'THEN'United States of America'WHENcountry ='UK'THEN'United Kingdom'ENDAScountry_nameFROMCustomers; Run Code Here, the...
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 ...
问SQL选择要更新的列inside CASE条件EN语法格式 case "变量" in 值1) 指令1 ;; ...
Inside the stored procedure, first, we get the country of the customer based on the input customer number. Then, we use the simple CASE statement to compare the country of the customer to determine the shipping time. If the customer locates in USA , the shipping period is 2-day shipping ...
SQL tools is the CASE statement. The CASE statement is a wily little fellow that can be added to both the SELECT portion of a SELECT statement as well as the ORDER BY portion. With CASE you can easily group data into various ranges, you can beautify the results of a SQL query, and ...
select case (1+2) -- (or_some_more_complicated_formula_yielding_a_numeric_result) when 200 then '200' when 100 then '100' else 'other' end hi_med_low from dual ; 但我需要做更多这样的事情: select case (1+2) -- (or_some_more_complicated_formula_yielding_a_numeric_result) when ...
Note:The syntax of theCASEstatement used inside stored programs differs slightly from that of the SQL CASE expression described inCASE OPERATOR. TheCASEstatement cannot have anELSE NULLclause, and it is terminated withEND CASEinstead ofEND.
This SQL tutorial for data analysis covers using if/then logic with the SQL CASE statement. CASE can include multiple conditions and be used with aggregate functions.
CASE statement in SQL returns Null CASE statement in WHERE clause for IS NULL: I want to say IS or IS NOT Null for a column using CASE Case Statement in Where clause with parameters SQL Server CASE statement inclusion and exclusions case statement inside a where clause with 'IN' operator ...