CASE can also be used in a SET statement, to assign a value to a variable: SET DATEFIRST 1DECLARE @isitfridayyet VARCHAR(100SET @isitfridayyet=CASE WHENDATEPART(WEEKDAY,GETDATE())=5 THEN'It''s Friday!'ELSE'It''s not yet Friday...'END PRINT @isitfridayyet To finish up, let’s t...
UPDATE table_name SET column_name = CASE WHEN condition1 THEN value1 WHEN condition2 THEN value2 ELSE column_name END WHERE columnname IN (value1, ...); Parameters: UPDATE table_name: Specifies the table that has to be updated CASE WHEN: Declares conditions to assign different values ...
Assign empty string '' if datetime is null Assign EXEC output to Variable Assigning NULL value to column name using Case Statement of where is SQL SERVER 2008 atomic if not exists() and insert or update Attempt to fetch logical page (1:155534) in database 7 failed. It belongs to allo...
Assign variable names (DECLARE STATEMENT). Initialize descriptors (DESCRIBE). Specify how error and warning conditions are handled (WHENEVER). Parse and run SQL statements (PREPARE,EXECUTE,EXECUTE IMMEDIATE). Retrieve data from the database (FETCH). ...
CONTEXT: PL/SQL function inline_code_block line 3 during statement block local variable initialization 1. 2. 3. 4. 5. 示例12-15 声明中触发的异常由上层块处理 \set SQLTERM / BEGIN DECLARE credit_limit CONSTANT NUMBER(3) := 5000; BEGIN NULL; END; EXCEPTION WHEN VALUE_ERROR THEN RAISE ...
and this time RAND() is evaluated a second time, and this time it yields a 1. Now the expression has no choice but to return the ELSE condition. The workaround for this is to assign the output of any non-deterministic expressions to a variable first, to ensure they are evaluated exactl...
DELTA_MERGE_ADD_VOID_COLUMN、DELTA_MERGE_INCOMPATIBLE_DATATYPE、DELTA_NOT_NULL_COLUMN_NOT_FOUND_IN_STRUCT、EVENT_TIME_IS_NOT_ON_TIMESTAMP_TYPE、INVALID_VARIABLE_TYPE_FOR_QUERY_EXECUTE_IMMEDIATE、PIVOT_VALUE_DATA_TYPE_MISMATCH、UNEXPECTED_INPUT_TYPE、UNEXPECTED_INPUT_TYPE_OF_NAMED_PARAMETER、UNPIVOT_...
In this case, the table variables are not suitable for packaging the statements of different types in a script file. You must assign a constant value to a variable and execute the SELECT * FROM Variable statement to convert the variable into a scalar value. The scalar value is used ...
TheCASEstatement is appropriate when there is some different action to be taken for each alternative. If you just need to choose among several values to assign to a variable, you can code an assignment statement using aCASEexpression instead. ...
@ return_variable can be specified only for Transact-SQL functions and not for CLR functions. select_stmt The single SELECT statement that defines the return value of an inline table-valued function (TVF). ORDER (<order_clause>) Specifies the order in which results are being returned from ...