Variable declaration syntax Use the following syntax to declare a variable. <variable_declaration> ::= <variable_name> [<type>] [ { DEFAULT | := } <expression>] Where: variable_name The name of the variable. The name must follow the naming rules for Object identifiers. type A SQL data...
-- Variable declaration [ DECLARE ... ] ... BEGIN ... -- Branching [ IF ... ] [ CASE ... ] -- Looping [ FOR ... ] [ WHILE ... ] [ REPEAT ... ] [ LOOP ... ] -- Loop termination (within a looping construct) [ BREAK ] [ CONTINUE ] -- Variable assignment [ LET ...
For SQL Server developers, the ISNULL function is a well-known function for replacing NULL with the specified value: DECLARE @val int SELECT ISNULL(@val,0) as Val The result of the code above will be 0, as the variable is declared but not initialized, so its value is NULL: If we t...
SQL statement to clone the database v_sql := ''CREATE DATABASE "'' || v_clone_db_name || ''" CLONE "'' || P_SOURCE_DB_NAME || ''"''; EXECUTE IMMEDIATE v_sql; OPEN c1; --Execute the output of the following to drop masking pols FOR row_variable IN c1 DO v_sql_loop :...
Since SQL variables are limited to a maximum size of 256 characters, you must use a scripting block rather than a SQL variable. DECLARE -- In the code below, $$ is the multiline string delimiter. -- $$ lets us include newlines, single and double quotes -- without needing to escape ...
您需要使用动态 SQL 并使用 EXECUTE IMMEDIATE 检查以下示例。 create or replace table temp as (with data as (select * from values ('Test'),('Best'),('Rest'), ('Lost and found')) select * from data); select * from temp; DECLARE res RESULTSET; col_name VARCHAR; select_statement VARCHA...
VARCHAR(max) and NVARCHAR(max) aka the LOB data types are variable-length data types that can store up to 2GB of data. Broadly speaking, there are two main standards for mapping code points to characters: non-Unicode and Unicode. Non-Unicode In SQL Server, most of the non-Unicode charact...
In SQL Server, in addition to theuniqueidentifier, we can also usebinary,Unicode,andnon-Unicodedatatypes (variable or fixed length) to store GUID values – more on that in the following section. Let’s store a big, positive numeric value into a UNIQUEIDENTIFIER and in a BINARY data type of...
DECLAREcounterINTEGERDEFAULT0;maximum_countINTEGERdefault5;BEGINFORiIN1TOmaximum_countDOcounter:=counter+1;END FOR;RETURNcounter;END; 注:SnowSQL、Classic Console、execute_streamまたはexecute_stringメソッドをPython Connectorコードで使用している場合は、代わりにこの例を使用してください(SnowSQL、 Clas...
See also DECLARE, OPEN, CLOSE Syntax FETCH <cursor_name> INTO <variable> [, <variable> ... ] ; Where: cursor_name The name of the cursor. variable The name of the variable into which to retrieve the value of one column of the current row. You should have one variable for each ...