MySQL使用SELECT FROM DUAL WHERE NOT EXISTS将多行插入空表

Question

如果表格肯定为空，我使用此代码插入默认行。我试图扩展它以插入多行，但无法弄清楚语法：

INSERT INTO myTable(`myCol`)
SELECT 'myVal'
FROM DUAL
WHERE NOT EXISTS (SELECT * FROM myTable);

我得到了什么（@Uueerdo）

CREATE TEMPORARY TABLE `myDefaults` ( name VARCHAR(100) NULL DEFAULT NULL);# MySQL returned an empty result set (i.e. zero rows).

INSERT INTO myDefaults (name) VALUES ('a'), ('b');# 2 rows affected.


SET @valCount := 0;# MySQL returned an empty result set (i.e. zero rows).

SELECT COUNT(1) INTO @valCount FROM blsf;# 1 row affected.


INSERT INTO blsf(name)
SELECT name 
FROM myDefaults 
WHERE @valCount > 0;# MySQL returned an empty result set (i.e. zero rows).


DROP TEMPORARY TABLE `myDefaults`;# MySQL returned an empty result set (i.e. zero rows).