搜索多个表，并在结果行中显示表名

您正在寻找动态SQL。从系统目录中自动组装您的查询：

SELECt string_agg('SELECT student_name, '''        || c.oid::regclass || ''' AS tbl, pid FROM '        || c.oid::regclass        || $$ WHERe student_name = 'John Doe'$$      , E'nUNIOn ALLn')FROM   pg_namespace nJOIN   pg_class     c ON c.relnamespace = n.oidWHERe  n.nspname = 'public'         -- schema name where your tables lieAND    c.relname LIKE 't%'          -- and / or filter table namesAND    EXISTS (   SELECt 1 FROM pg_attribute    WHERe  attrelid = c.oid   AND    attname = 'student_name'  -- make sure column exists   AND    NOT attisdropped          -- and is alive   );

产生查询字符串：

SELECT student_name, 'tbl1' AS tbl, pid FROM tbl1 WHERe student_name = 'John Doe'UNIOn ALLSELECt student_name, 'tbl2' AS tbl, pid FROM tbl2 WHERe student_name = 'John Doe'UNIOn ALLSELECt student_name, 'tbl3' AS tbl, pid FROM tbl3 WHERe student_name = 'John Doe'...

然后在第二个调用中运行它，或者使用来使用PL /
pgSQL函数完全自动化它

EXECUTE

该查询生成带有经过清理的标识符的 安全
代码，以防止SQL注入。
（

oid::regclass

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顺便说一句，

LIKE

student_name LIKE 'John Doe'

=