how use declare variable in DataGrip? not work ((

Hello, I have use variable in my sql script in  postgres,, but have a problem in consol  syntax error  in my script

how a fix this problem?


declare  myvar int;        

sql> declare myvar int;

[2018-05-22 11:59:40] [42601] ОШИБКА: ошибка синтаксиса (примерное положение: "int")


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