mysql可参考的查询

• 获取批量修改列为大写SQL脚本

SELECT
    concat( 'alter table ', TABLE_NAME, ' change column ', COLUMN_NAME, '  ', UCASE( COLUMN_NAME ), '  ', COLUMN_TYPE,' ',EXTRA,' comment "',COLUMN_COMMENT,'";' ) AS '修改脚本'
FROM
    information_schema.COLUMNS
WHERE
    TABLE_SCHEMA = '数据库名'

• 获取批量修改表为小写SQL脚本

SELECT
    concat( 'alter table ', TABLE_NAME, ' rename to ', LCASE( TABLE_NAME ), ';' ) AS ‘修改脚本’
FROM
    information_schema.TABLES
WHERE
    TABLE_SCHEMA = '数据库名'

• 获取批量修改表列SQL脚本

SELECT
    concat( 'alter table ', TABLE_NAME, ' modify ', COLUMN_NAME,' decimal(18,3);' ) AS '修改脚本'
FROM
    information_schema.COLUMNS
WHERE
    TABLE_SCHEMA = 'meritdata' AND (COLUMN_TYPE LIKE 'decimal%' or COLUMN_TYPE LIKE 'float%') AND COLUMN_TYPE LIKE '%,2)' AND TABLE_NAME in (
        'I_AM_TABLE_NAME'
        )

• 备份SQL查询结果

mysql -uroot -p -e 'select * from testdb.info'>/opt/supwang/wzz.sql