如何从名称为数据集字段的表中加入一些数据?
像这样:
SELECT *
FROM dataset
INNER JOIN dataset.table_name
ON dataset.param_id = (dataset.table_name).id_(dataset.table_name)
您必须使用 T-SQL 将 select 语句构造为字符串。然后,使用执行命令运行它。例如:
DECLARE @sql VARCHAR(MAX);
DECLARE @table_name VARCHAR(100);
SET @table_name = (SELECT TOP 1 table_name FROM dataset) ' TODO set criteria correctly here
SELECT @sql = 'SELECT * FROM dataset INNER JOIN ' & @table_name & ' ON dataset.param_id = ' & @table_name & '.id_' & @table_name & ';'
EXEC (@sql)
更新
这是 Oracle 的语法(引自Andrewst在此处的回答):
DECLARE
TYPE rc_type REF CURSOR;
rc rc_type;
table_rec table%ROWTYPE;
BEGIN
OPEN rc FOR 'select * from table';
LOOP
FETCH rc INTO table_rec;
EXIT WHEN rc%NOTFOUND;
-- Process this row, e.g.
DBMS_OUTPUT.PUT_LINE( 'Name: '||table_rec.name );
END LOOP;
END;
http://www.dbforums.com/oracle/718534-ms-sql-exec-equivalent.html