SQL语句：
SELECT
CONCAT(
'ALTER TABLE ',
table_name,
' RENAME TO db_',
substring(table_name, 4), ';' ) FROM information_schema. TABLES WHERE table_name LIKE 'ct%';
Q : 823053937
SELECT
CONCAT(
'ALTER TABLE ',
table_name,
' RENAME TO db_',
substring(table_name, 4), ';' ) FROM information_schema. TABLES WHERE table_name LIKE 'ct%';
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