MySQL运维SQL
信息统计
查询数据库有多少张表
SELECT COUNT(*) AS table_count FROM information_schema.TABLES WHERE table_schema = '数据库名';
查询表中有多少个字段
SELECTCOUNT(*) AS field_count
FROMinformation_schema.COLUMNS
WHEREtable_schema = '数据库名' AND table_name = '表名';
查询表中有哪些非空约束字段
SELECT COLUMN_NAME
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_SCHEMA = '数据库名' AND TABLE_NAME = '表名' AND IS_NULLABLE = 'NO';
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：根据名称或函数以及要传递给它的参数列表构造并执行函数调用)
