variable_name data_type [ NOT NULL ] [ { DEFAULT | := |= } expression ]; variable_name 是变量的名称,通常需要指定一个有意义的名称; data_type 是变量的类型,可以是任何 SQL 数据类型; 如果指定了 NOT NULL,必须使用后面的表达式为变量指定初始值。 变量声明示例: DO $$ DECLARE name text; age ...
-- Define an associative array of variable length strings. TYPE calendar_table IS TABLE OF VARCHAR2(9 CHAR) INDEX BY VARCHAR2(9 CHAR); -- Declare and construct a varray. month MONTHS_VARRAY := months_varray('January','February','March' ,'April','May','June' ,'July','August','Sept...
out returnValue text ) AS $$ DECLARE ex_result integer default0; ex_sql text; BEGIN ex_sql:='insert into'||quote_ident(tablename)||'('||array_to_string(fieldname,',')||') values('''||array_to_string(fieldvalue,''',''')||''')'; execute ex_sql; GET DIAGNOSTICS ex_result:...
How to Declare a Variable in Postgres? A variable in Postgres is always declared with a particular data type, such as INTEGER, TEXT, DATE, TIME, etc. Here is the syntax to declare a variable in Postgres: DECLARE var_name < CONSTANT > data_type < NOT NULL > < { DEFAULT | := } ex...
postgres=#DO$$postgres$#DECLAREpostgres$#nametext;postgres$#BEGINpostgres$#name:='PL/pgSQL';postgres$#RAISENOTICE'Hello %!',name;postgres$#END$$;NOTICE:HelloPL/pgSQL! 嵌套子块 PL/pgSQL 支持代码块的嵌套,也就是将一个代码块嵌入其他代码块的主体中。被嵌套的代码块被称为子块(subblock),包含子...
...前言 MySQL存储过程中,定义变量有两种方式: 1、使用set或select直接赋值,变量名以@开头 例如: set @var=1; 可以在一个会话的任何地方声明,作用域是整个会话,称为用户变量...2、以declare关键字声明的变量,只能在存储过程中使用,称为存储过程变量,例如: declare var1 int default 0; 主要用在存储过程中,...
create or replace procedure fun1(a in integer) as $$ declare cur cursor for select * from t10 order by f1; begin ... end; $$ LANGUAGE plpgsql ; 声明中游标是怎么解析的? cur cursor for select * from t10 order by f1; step1 语法树 代码语言:javascript 代码运行次数:0 运行 AI代码解释...
CLOSE cursor_variable; 1. 五、其他 -- 临时表返回结果例子 BEGIN; DO $$ DECLARE temp_geometry st_geometry; geometry_record RECORD; cur_geometry CURSOR FOR SELECT shape as shape FROM mainbasin; BEGIN OPEN cur_geometry; FETCH cur_geometry INTO temp_geometry; ...
DECLARE stmt VARCHAR(200); dept_no_array numeric[]; c numeric; begin dept_no_array[1]:= 10; dept_no_array[2]:= 20; /* Put some values into thearray*/ dept_no_array[3]:= 30; dept_no_array[4]:= 40; dept_no_array[5]:= 30; ...
Fixed SESSION_USER/SYSTEM_USER in SET/PRINT/DECLARE variable assignment returning wrong result/error. Fixed issue of blocking of UNIQUE constraint/index on nullable column not implemented consistently. Fix a crash with T-SQL OPENQUERY() and four-part object name when T-SQL keywords are used as ...