Approach: UsingUPDATEandCASE...WHEN[Accepted] Algorithm To dynamically set a value to a column, we can useUPDATEstatement together whenCASE...WHEN...flow control statement. MySQL UPDATEsalarySETsex=CASEsexWHEN'm'THEN'f'ELSE'm'END;
CASE n_str WHEN n_str = 'profileStatus' THEN UPDATE tbl_contact SET status = 'A' WHERE id = id; -- The above statement updates the entire table instead of the right row WHEN n_str = 'phoneNumberMobile' THEN UPDATE tbl_contact SET mobile_phone = v_str ...
以上LINQ语句转换成SQL语句如下: CASEWHEN([ul].[IsDisabled]=1OR[l].[IsDisabled]=1)THENcast(1asbit)WHEN(NOT([ul].[IsDisabled]=1OR[l].[IsDisabled]=1))THENcast(0asbit)ENDAS[IsDisabled]
SQL UPDATE statement examples Let’s take a look at some examples of usingUPDATEstatement with theemployeestable: SQL UPDATE one column example Suppose Janet, who has employee id 3, gets married so that you need to change her last name in theemployeestable. ...
ENDends theCASEstatement ASspecifies the namealias_namefor the new column tableis the name of the table. Note:The syntax ofCASEalways starts with theCASEkeyword and ends with theENDkeyword followed by a column name alias. Example: Voter Eligibility Using SQL CASE ...
收到的错误是SQL UPDATE 语句 Update 语句用于修改表中的数据。 语法： UPDATE 表名称 SET 列名称 ...
-- update all rowsUPDATECustomersSETcountry ='NP'; Run Code Here, the SQL command changes the value of thecountrycolumn toNPfor all rows. Note:We should be cautious while using theUPDATEstatement. If we omit theWHEREclause, all the rows will be changed, and this change is irreversible. ...
USE tempdb; GO -- UPDATE statement with CTE references that are correctly matched. DECLARE @x TABLE (ID INT, Value INT); DECLARE @y TABLE (ID INT, Value INT); INSERT @x VALUES (1, 10), (2, 20); INSERT @y VALUES (1, 100),(2, 200); WITH cte AS (SELECT * FROM @x) UPD...
CASEcan be used in any statement or clause that allows a valid expression. For example, you can useCASEin statements such as SELECT, UPDATE, DELETE and SET, and in clauses such as, IN, WHERE, ORDER BY, and HAVING. Transact-SQL syntax...
CASE n_str WHEN n_str = 'profileStatus' THEN UPDATE tbl_contact SET status = 'A' WHERE id = id; -- The above statement updates the entire table instead of the right row WHEN n_str = 'phoneNumberMobile' THEN UPDATE tbl_contact SET mobile_phone = v_str ...