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# 查询数据库相应用户dsideal的所有序列
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SELECT
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*
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FROM
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pg_class
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WHERE
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relowner = (SELECT usesysid FROM pg_user WHERE usename = 'dsideal')
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AND relkind = 'S'
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# 查询所有表名字，默认schema名字是public
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SELECT
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tablename
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FROM
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pg_tables
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WHERE
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schemaname = 'public'
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# 查询已知表名tableName的所有字段的字段名、类型、是否为空、注释
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SELECT
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A.attname AS NAME,
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format_type(A.atttypid, A.atttypmod) AS TYPE,
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A.attnotnull AS NOTNULL,
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col_description(A.attrelid, A.attnum) AS COMMENT
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FROM
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pg_class AS C,
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pg_attribute AS A
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WHERE
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C.relname = 'tableName'
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AND A.attnum > 0
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AND A.attrelid = C.oid
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# 需要注意修改一下
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mysql:ifnull <--> pgsql:coalesce
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