- [°ÀÇ]µ¥¾îÅͺ£À̽º·Ð SQL °ü·Ã ¹®ÀÇ
- 2020-07-10
±³¼ö´Ô ¾È³çÇϼ¼¿ä. ±³¼ö´Ô µ¿¿µ»ó °ÀÇ µè°í ÀÖ´Â ¼ºÁØÈ£¶ó°í ÇÕ´Ï´Ù.
Àü»êÁ÷ ±º¹«¿ø ½ÃÇè ÀÏÁÖÀÏ ³²Àº ½ÃÁ¡¿¡¼ ¸¶Áö¸· Áú¹®ÀÌ µÉ °Í°°³×¿ä.
1. Group by °ü·Ã Áú¹®
Select (»ó¼ö, Áý°èÇÔ¼ö, group by¿¡¼ ÁöÁ¤ÇÑ ¼Ó¼º)
Group by (¼Ó¼º)
having (»ó¼ö, Áý°èÇÔ¼ö, group by¿¡¼ ÁöÁ¤ÇÑ ¼Ó¼º)
- Group by¿¡¼ ¼Ó¼ºÀ» ÁÖ°í Select Àý¿¡¼ ¸ðµç¼Ó¼º * À» ÁáÀ» ¶§ ¿À·ù°¡ ¹ß»ýÇϳª¿ä?
- Group by ¼Ó¼º 2°³ ºÎ¿©¼ Select Àý¿¡¼µµ »ó¼ö, Áý°èÇÔ¼ö Á¦¿Ü ¹«Á¶°Ç ¼Ó¼ºÀÌ 2°³¿©¾ß ÇÏ´ÂÁö?
- »ó¼ö°¡ ¾²ÀÎ ¿¹¹®Àº ¾î¶»°Ô µÇ´ÂÁö?
2. Select¹® °ü·Ã
¼ø¼
Select --5
From --1
Where --2 (³»ºÎÄõ¸®)
Group by --3
having --4
Order by --6
-whereÀý¿¡ ³»ºÎÄõ¸®°¡ ÀÖÀ» ¶§ ³»ºÎÄõ¸® ½ÇÇà¼ø¼´Â 1.5·Î Çؼ®ÇÏ¸é µÇ³ª¿ä?
Select
From
Where Çйø=(³»ºÎÄõ¸®)
- Çйø=(³»ºÎÄõ¸®)´Â °á°ú°ª 1°³¸¸ Ãâ·ÂÀ» Çϴµ¥ ½ÃÇè¹®Á¦¿¡¼ ÀÌ·¸°Ô ³ª¿À¸é Ʋ¸°°ÍÀ¸·Î Çؼ®ÇÏ¸é µÇ³ª¿ä?
SQL¹®¸¸ ºÁ¼´Â °á°ú°ªÀÌ 1°³ÀÏÁö ´Ù¼öÀÏÁö ¾Ë¼ö°¡ ¾ø¾î¼....
Where Á¶ÀÎÁ¶°Ç AND (³»ºÎÄõ¸®)
- ³»ºÎÄõ¸® ¾Õ Á¶°ÇÀÌ ¾ø¾î Ʋ¸°¹®ÀåÀ¸·Î º¸¸é µÇ´Â°ÍÀÎÁö?
3. ºä °ü·Ã
Create view
From
Where Àü°ø='ÄÄÇ»ÅÍ' with check option
- ºä¿¡ ´ëÇؼ insert, update, delete ½Ã Àü°ø='ÄÄÇ»ÅÍ' Á¦¾àÁ¶°Ç¿¡ ´Ù Àû¿ë¹Þ³ª¿ä?
- From Àý¿¡¼ ÇϳªÀÇ Å×À̺íÀÌ ¾Æ´Ñ ´ÙÁßÅ×ÀÌºí »ç¿ë½Ã¿¡µµ insert, update, delete »ç¿ëÀÌ Á¦Çѵdzª¿ä?
4. ¸¶Áö¸·À¸·Î Àü»êÁ÷ ±º¹«¿ø ½ÃÇè ÀÏÁÖÀÏÀ» ³²°ÜµÎ°í ÇöÀç ÀڷᱸÁ¶·Ð, µ¥ÀÌÅͺ£À̽º·Ð ÀÌ·Ð, ´Ü¿øº° ¹®Á¦, µ¿Çü ¹®Á¦ µîÀ» °è¼Ó Ç®°íÀִµ¥ ½ÃÇèÀü¿¡ Ãß°¡·Î °øºÎÇϸé ÁÁÀº °ÍÀÌ ÀÖÀ¸¸é ÃßõÇØÁÖ½Ã¸é °¨»çÇÏ°Ú½À´Ï´Ù.(¾Æ´Ï¸é ÁßÁ¡ÀûÀ¸·Î °øºÎÇØ¾ß ÇÒ°Í µî)
ÀÌ»óÀÔ´Ï´Ù. °¨»çÇÕ´Ï´Ù.