类型 内部名称 说明 VARCHAR(n) varchar 指定了最大长度,变长字符串,不足定义长度的部分不补齐 CHAR(n) bpchar 定长字符串,实际数据不足定义长度时,以空格补齐 TEXT text 没有特别的上限限制(仅受行的最大长度限制) BYTEA bytea 变长字节序列(使用NULL字符也是允许的) "char" char 单个字符 在系统表和在...
null首先跟char、varchar、bpchar(blank padded character)、text有关系。在oracle中,则与char、varchar2、clob有关。 其次,涉及的范围比较广,''、null、=、!=、is null、is not null、替换、计算长度、类型强转如cast(null as date),以及它们之间的组合。 zjh@postgres=# select null = ''; ?column? ---...
Bpchar String String Lookup activity properties To learn details about the properties, check Lookup activity. Upgrade the PostgreSQL connector Here are steps that help you upgrade your PostgreSQL connector: Create a new PostgreSQL linked service and configure it by referring to Linked service propertie...
Bpchar String String Lookup activity properties To learn details about the properties, check Lookup activity. Upgrade the PostgreSQL connector Here are steps that help you upgrade your PostgreSQL connector: Create a new PostgreSQL linked service and configure it by referring to Linked service propertie...
postgresql与lightdb中的null行为及oracle、mysql的兼容性,null首先跟char、varchar、bpchar(blank padded character)、text有关系。在oracle中,则与char、varchar2、clob有关。